{"id":66911,"date":"2026-10-13T10:12:19","date_gmt":"2026-10-13T07:12:19","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66911"},"modified":"2026-10-13T10:12:19","modified_gmt":"2026-10-13T07:12:19","slug":"biochemical-oxygen-demand-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/chemistry\/biochemical-oxygen-demand-calculator\/","title":{"rendered":"Biochemical Oxygen Demand Calculator"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Find BOD\u2085 from a Diluted Sample<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66911\" data-favorite-title=\"Biochemical Oxygen Demand\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/chemistry\/biochemical-oxygen-demand-calculator\/\" data-favorite-excerpt=\"Calculate the 5-day biochemical oxygen demand (BOD\u2085) of a diluted water sample from initial and final dissolved oxygen, dilution fraction, and optional seed correction, following APHA Standard Methods 5210B.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-biology\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/chemistry\/biochemical-oxygen-demand-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66911\" data-post=\"66911\"><fieldset class=\"fieldset-input is-2\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"is-single field\" id=\"input-1\"><span class=\"font-semibold\">Diluted Sample Bottle<\/span><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-2\">Initial DO (D\u2081)<\/label><div class=\"term\">D\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"initial_do_d\" id=\"field-2\" aria-describedby=\"calc-unit-2 calc-info-2\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 9.0\" min=\"0\" value=\"9\"\/><div class=\"unit\" id=\"calc-unit-2\">mg\/L<\/div><small id=\"calc-info-2\">Dissolved oxygen measured in the diluted sample right after preparation (day 0).<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Final DO after 5 Days (D\u2082)<\/label><div class=\"term\">D\u2082<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"final_do_after_5_days_d\" id=\"field-3\" aria-describedby=\"calc-unit-3 calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 4.2\" min=\"0\" value=\"4.2\"\/><div class=\"unit\" id=\"calc-unit-3\">mg\/L<\/div><small id=\"calc-info-3\">Dissolved oxygen remaining in the same bottle after 5 days of incubation at 20 \u00b0C in the dark.<\/small><\/div><div class=\"is-single field\" id=\"input-4\"><span class=\"font-semibold\">Dilution<\/span><\/div><div class=\"field has-term\" id=\"input-5\"><label for=\"field-5\">Dilution Fraction (P)<\/label><div class=\"term\">P<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"dilution_fraction_p\" id=\"field-5\" aria-describedby=\"calc-unit-5 calc-info-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 5\" min=\"0\" max=\"100\" value=\"5\"\/><div class=\"unit\" id=\"calc-unit-5\">%<\/div><small id=\"calc-info-5\">Portion of the final bottle volume that is the original water sample. A 5% dilution means 1 part sample in 20 parts total (a common choice for wastewater).<\/small><\/div><div class=\"is-single field\" id=\"input-6\"><span class=\"font-semibold\">Seed Correction (optional)<\/span><\/div><div class=\"field is-checkbox is-single\" id=\"input-7\"><input type=\"checkbox\" id=\"field-7\" value=\"1\"\/><label for=\"field-7\">Apply seed correction<\/label><\/div><div class=\"field has-term\" id=\"input-8\" hidden><label for=\"field-8\">Seed Control Initial DO (B\u2081)<\/label><div class=\"term\">B\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"seed_control_initial_do_b\" id=\"field-8\" aria-describedby=\"calc-unit-8 calc-info-8\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 9.0\" min=\"0\" value=\"9\"\/><div class=\"unit\" id=\"calc-unit-8\">mg\/L<\/div><small id=\"calc-info-8\">Day-0 dissolved oxygen of the seed control bottle (seeded dilution water without sample).<\/small><\/div><div class=\"field has-term\" id=\"input-9\" hidden><label for=\"field-9\">Seed Control Final DO (B\u2082)<\/label><div class=\"term\">B\u2082<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"seed_control_final_do_b\" id=\"field-9\" aria-describedby=\"calc-unit-9 calc-info-9\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 6.6\" min=\"0\" value=\"6.6\"\/><div class=\"unit\" id=\"calc-unit-9\">mg\/L<\/div><small id=\"calc-info-9\">Dissolved oxygen of the seed control bottle after 5 days of incubation.<\/small><\/div><div class=\"field has-term\" id=\"input-10\" hidden><label for=\"field-10\">Seed Fraction (f)<\/label><div class=\"term\">f<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"text\" name=\"seed_fraction_f\" id=\"field-10\" aria-describedby=\"calc-info-10\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" placeholder=\"e.g. 0.05\" min=\"0\" value=\"0.05\"\/><small id=\"calc-info-10\">Ratio of seed volume in the sample bottle to seed volume in the seed control bottle. Often equal to the dilution fraction P when the same seeded water is used.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66911\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Your Results<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>BOD\u2085<\/span><span class=\"result-term\">BOD\u2085<\/span><\/span><span class=\"field-value\" id=\"result-1\" data-unit=\"mg\/L\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-2\"><span class=\"field-title\"><span>Calculation Details<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-3\"><span class=\"field-title\"><span>About the BOD\u2085 Test<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Leave a Comment<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"66911\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inaccurate <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Biochemical Oxygen Demand (BOD\u2085)<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ \\mathrm{BOD}_5 = \\frac{(D_1 - D_2) - (B_1 - B_2)\\,f}{P} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(D_1\\) \u2014 dissolved oxygen in the diluted sample at day 0 (mg\/L)<\/li>\n<li>\\(D_2\\) \u2014 dissolved oxygen remaining after 5 days of incubation at 20 \u00b0C (mg\/L)<\/li>\n<li>\\(B_1\\) \u2014 day-0 dissolved oxygen in the seed control bottle (mg\/L)<\/li>\n<li>\\(B_2\\) \u2014 dissolved oxygen in the seed control bottle after 5 days (mg\/L)<\/li>\n<li>\\(f\\) \u2014 seed fraction: ratio of seed volume in the sample bottle to seed volume in the control bottle<\/li>\n<li>\\(P\\) \u2014 dilution fraction, the portion of the final bottle volume that is the original sample (entered as a percentage, e.g. 5% = 0.05)<\/li>\n<\/ul>\n<p>The numerator is the oxygen actually consumed by the organic matter in the sample (after subtracting the seed's own demand); dividing by \\(P\\) scales this depletion back up to the demand of the undiluted water.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Biochemical Oxygen Demand \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Example:<\/strong> a wastewater sample is diluted to 5% (1 part sample in 20 parts total) with seeded dilution water. The diluted bottle shows \\(D_1 = 9.0\\) mg\/L initially and \\(D_2 = 4.2\\) mg\/L after 5 days. The seed control bottle drops from \\(B_1 = 9.0\\) to \\(B_2 = 6.6\\) mg\/L, and the seed fraction is \\(f = 0.05\\).<\/p>\n<p>\\[ D_1 - D_2 = 9.0 - 4.2 = 4.8 \\text{ mg\/L} \\]<\/p>\n<p>\\[ (B_1 - B_2)\\,f = (9.0 - 6.6) \\times 0.05 = 0.12 \\text{ mg\/L} \\]<\/p>\n<p>\\[ \\mathrm{BOD}_5 = \\frac{4.8 - 0.12}{0.05} = \\frac{4.68}{0.05} = 93.6 \\text{ mg\/L} \\]<\/p>\n<p><strong>Result:<\/strong> BOD\u2085 = 93.6 mg\/L \u2014 a moderately polluted wastewater, well above the 20 mg\/L validity threshold of the standard method.<\/p>\n<p>\n\r\n<\/section>\n<h2>How to Use the BOD Calculator<\/h2>\n<ol>\n<li>Enter the <strong>Initial DO (D\u2081)<\/strong> \u2014 the dissolved oxygen of the diluted sample measured immediately after preparing the bottle (day 0), in mg\/L.<\/li>\n<li>Enter the <strong>Final DO after 5 Days (D\u2082)<\/strong> \u2014 the dissolved oxygen in the same bottle after 5 days of incubation at 20 \u00b0C in the dark.<\/li>\n<li>Enter the <strong>Dilution Fraction (P)<\/strong> as a percentage of the bottle volume that is original sample. A 1:20 dilution means 5%; an undiluted bottle is 100%.<\/li>\n<li>If the sample was seeded, tick <strong>Apply seed correction<\/strong> and fill in <strong>Seed Control Initial DO (B\u2081)<\/strong>, <strong>Seed Control Final DO (B\u2082)<\/strong>, and the <strong>Seed Fraction (f)<\/strong>. If no seed was used, leave the box unticked.<\/li>\n<li>Read the <strong>BOD\u2085<\/strong> result in mg\/L, along with the step-by-step calculation details and any validity warnings from the standard method.<\/li>\n<\/ol>\n<h2>What Is BOD\u2085 and Why It Matters<\/h2>\n<p>The five-day biochemical oxygen demand (BOD\u2085) is the mass of dissolved oxygen that aerobic microorganisms consume while breaking down the organic matter in a water sample over 5 days at 20 \u00b0C. It is the most widely used measure of the biodegradable organic pollution load of a water: the higher the BOD\u2085, the more oxygen the discharge will strip from the receiving river or lake as it decomposes.<\/p>\n<p>Because most wastewaters would use up all the oxygen in a full bottle long before day 5, the sample is diluted with oxygen-saturated dilution water. The measured depletion then reflects only the diluted mixture, so the formula divides by the dilution fraction \\(P\\) to recover the demand of the original, undiluted water.<\/p>\n<p>When the water itself contains too few bacteria \u2014 typical for treated effluents or industrial wastes \u2014 the dilution water is <em>seeded<\/em> with microorganisms, usually settled domestic sewage or a commercial seed preparation. The seed consumes oxygen too, so its own demand is measured in a parallel seed-control bottle and subtracted, scaled by the seed fraction \\(f\\), before dividing by \\(P\\).<\/p>\n<p>BOD\u2085 is routinely used for treatment-plant design and compliance monitoring, and it complements the <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/chemical-oxygen-demand-calculator\/\">Chemical Oxygen Demand (COD)<\/a>, which measures the total oxidizable load (biodegradable and non-biodegradable) in a much faster test. The BOD\/COD ratio is a common indicator of how biologically treatable a wastewater is. For the kinetics of the microbial reactions involved, see also the <a href=\"https:\/\/wpcalc.com\/en\/chemistry\/michaelis-menten-calculator\/\">Michaelis\u2013Menten calculator<\/a>.<\/p>\n<h2>Interpreting Typical BOD\u2085 Values<\/h2>\n<table>\n<thead>\n<tr>\n<th>Water type<\/th>\n<th>Typical BOD\u2085 (mg\/L)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Clean river \/ stream<\/td>\n<td>1\u20135<\/td>\n<\/tr>\n<tr>\n<td>Moderately polluted river<\/td>\n<td>5\u201320<\/td>\n<\/tr>\n<tr>\n<td>Treated municipal effluent<\/td>\n<td>10\u201330<\/td>\n<\/tr>\n<tr>\n<td>Raw domestic sewage<\/td>\n<td>150\u2013400<\/td>\n<\/tr>\n<tr>\n<td>Strong industrial waste<\/td>\n<td>up to several thousand<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Assumptions, Limitations and Practical Tips<\/h2>\n<ul>\n<li><strong>Standard conditions:<\/strong> the calculator assumes incubation for 5 days at 20 \u00b1 1 \u00b0C in the dark, per APHA Standard Methods 5210B. Nitrification is not inhibited unless a TCMP inhibitor was added to the bottles.<\/li>\n<li><strong>Validity criteria:<\/strong> the standard method is only valid if the oxygen depletion is at least 2 mg\/L, the residual DO is at least 1 mg\/L, and the resulting BOD\u2085 is at least 20 mg\/L. The calculator flags violations of these criteria \u2014 if they appear, repeat the test with a more suitable dilution.<\/li>\n<li><strong>Choosing the dilution:<\/strong> aim for a depletion of roughly 3\u20135 mg\/L from a starting DO near saturation (~9 mg\/L at 20 \u00b0C). For an unknown sample, prepare several bottles with different dilutions (e.g. 1%, 2%, 5%, 10%) and use the valid one.<\/li>\n<li><strong>Seed fraction:<\/strong> when the same seeded dilution water is used in both bottles, \\(f\\) typically equals the dilution fraction expressed as a decimal (e.g. 0.05 for a 5% dilution). Adjust it if the seed volumes differ.<\/li>\n<li><strong>Immediate readings:<\/strong> D\u2081 and B\u2081 must be measured at day 0, not assumed from saturation tables, especially after sample mixing and temperature equilibration.<\/li>\n<li><strong>Dilution water blank:<\/strong> a separate blank check on the unseeded dilution water should not consume more than 0.2 mg\/L over 5 days; higher blanks contaminate every result.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Calculate the 5-day biochemical oxygen demand (BOD\u2085) of a diluted water sample from initial and final dissolved oxygen, dilution fraction, and optional seed correction, following APHA Standard Methods 5210B.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[54],"tags":[60],"class_list":["post-66911","post","type-post","status-publish","format-standard","hentry","category-chemistry","tag-biochemistry"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66911","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=66911"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66911\/revisions"}],"predecessor-version":[{"id":66912,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66911\/revisions\/66912"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}