{"id":11692,"date":"2021-03-08T11:39:08","date_gmt":"2021-03-08T10:39:08","guid":{"rendered":"https:\/\/www.gesi.de\/blog\/2021\/03\/18\/curious-classification-acute-toxicity\/"},"modified":"2024-07-12T15:58:57","modified_gmt":"2024-07-12T13:58:57","slug":"curious-classification-acute-toxicity","status":"publish","type":"post","link":"https:\/\/www.gesi.de\/en\/curious-classification-acute-toxicity\/","title":{"rendered":"Curious classification: acute toxicity"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">How is the &#8220;acute toxicity&#8221; classification determined?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The reason for this blog entry was a question from a user of the <a href=\"https:\/\/sdbcheck.de\/\" target=\"_blank\" rel=\"noopener\">SDBcheck\u00ae<\/a> online tool on the topic of acute toxicity: &#8220;How does the classification Acute Tox. 2 with H330 result, even though none of the individual components is also classified as &#8220;Acute Tox.&#8221;?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">A quick overview<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In accordance with the <a href=\"https:\/\/www.gesi.de\/lexikon\/clp-verordnung\/\" target=\"_blank\" rel=\"noopener\">CLP Regulation<\/a>, the acute toxicity can be calculated based on the toxicity of the components. If toxicity data are available for a component (e.g. LD<sub>50<\/sub> or LC<sub>50<\/sub>), they must be used in the calculation. Only if none of those values are present, &#8220;replacement values&#8221; are used if the component is classed as &#8220;Acute Tox.&#8221; (conversion values of Table 3.1.2 in the CLP Regulation). It is important to know that acute toxicity always has &#8220;three parts&#8221;. This means that information may exist for oral, dermal or inhalative toxicity, and sometimes for all three of these routes of exposure.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Special case: inhalative toxicity<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Let&#8217;s take a closer look at inhalative toxicity:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If the mixture is a <strong>gas<\/strong>, things are relatively simple: the toxicity of the component as a gas is relevant for the calculation of the toxicity.<\/li>\n\n\n\n<li>If the mixture is <strong>solid<\/strong> or <strong>liquid<\/strong>, a distinction must be made if a toxicity specification is present for vapour or dust\/mist. This is often the relevant difference.<\/li>\n\n\n\n<li><strong>Vapour<\/strong>: Best viewed as a liquid which evaporates over time. The droplets of the liquid are then suspended in the air and can (could) be inhaled.<\/li>\n\n\n\n<li><strong>Dust\/mist<\/strong>: If the mixture is a powder, inhalative dust can be created, for example when pouring the product. If the product is sprayed, for example spray paint particles, this is called a mist.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The answer<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">I&#8217;m sure you have spotted the first part of the answer already: if tox. values exist (provided in Section 11 of the safety data sheet), the classification is made using this information. This means that a classification of the component(s) as toxic is not necessary for this purpose. But the second part is more difficult. The safety data sheet often simply states &#8220;LC<sub>50<\/sub> inhalative&#8221;. What does information such as 6.82 mg\/L refer to in this context? &#8220;Gas&#8221; can be excluded as an answer straight away, because the unit would be &#8220;ppmV&#8221;. Deciding whether the component is a &#8220;vapour&#8221; or &#8220;dust\/mist&#8221; is best determined via the aggregate state of the product: &#8220;liquid&#8221; indicates &#8220;vapour&#8221;, &#8220;solid&#8221; or &#8220;powdered&#8221; indicates &#8220;dust\/mist&#8221;.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Calculation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The component with &#8220;LC<sub>50<\/sub> inhalative&#8221; of 6.82 mg\/L is included in the product with (up to) 45%. We will assume that the remaining 55% are &#8220;unknown&#8221;. The calculation then results in an &#8220;ATE<sub>mix<\/sub>&#8221; of 6.82 mg\/L (=[100% &#8211; 55%] * 6,82 mg\/L : 45%).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>In accordance with Table 3.1.1 of the CLP Regulation, for &#8220;vapour&#8221;, this means Acute Tox. 3, H331.<\/li>\n\n\n\n<li>For &#8220;dust\/mist&#8221; however, no classification is established in accordance with Table 3.1.1 of the CLP Regulation.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Incidentally, if the remaining 55% were &#8220;non-hazardous\u201d instead of \u201cunknown\u201d, our example for &#8220;vapour&#8221; would have resulted in the classification &#8220;Acute Tox. 4, H332&#8221;.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When calculating the classification for acute toxicity, it follows that the correct application of the toxicological information is very important. As a result, when carrying out the classification calculation you should only use toxicological information which is as secure as possible, e.g. provided by ECHA or GESTIS. See <a href=\"https:\/\/www.gesi.de\/blog\/2018\/06\/18\/gemisch-einstufung-quellen-mit-gefahrstoff-informationen\/\" target=\"_blank\" rel=\"noopener\">this<\/a> blog entry as well. If you know that a certain route of exposure for a substance does not have acute toxicity, explicitly set this route of exposure to &#8220;non-hazardous&#8221;. When using SDBcheck\u00ae, pay attention to the precise route of exposure involved. This applies in particular to &#8220;surprising&#8221; deviations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sources:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><em>Regulation (EC) No 1907\/2006 (REACH Regulation), <\/em><a href=\"https:\/\/eur-lex.europa.eu\/legal-content\/de\/TXT\/?uri=CELEX:02006R1907-20200824\" target=\"_blank\" rel=\"noopener\"><em>consolidated version<\/em><\/a><em> dated 24\/08\/2020<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>How is the &#8220;acute toxicity&#8221; classification determined? The reason for this blog entry was a question from a user of the SDBcheck\u00ae online tool on the topic of acute toxicity: [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":18805,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false,"footnotes":""},"categories":[1166],"tags":[818,874,1038,1075],"class_list":["post-11692","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sds-authoring","tag-acute-toxicity-en","tag-classification-en","tag-plausibility-check-en","tag-safety-data-sheet-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Curious classification: acute toxicity - GeSi<\/title>\n<meta name=\"description\" content=\"In accordance with the CLP Regulation, the acute toxicity is calculated based on the toxicity of the components. 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