---
title: "Osmium tetroxide (20816-12-0): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/osmium-tetroxide-20816-12-0/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/osmium-tetroxide-20816-12-0/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/osmium-tetroxide-20816-12-0/
---

Hazard search

# Osmium tetroxide

CAS number

20816-12-0

Also known as

Osmium oxide · Osmium tetraoxide (as Os)

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 0.0002 ppm |  |
| 8-hour TWA | 0.002 mg/m³ |  |
| 15-minute STEL | 0.0006 ppm |  |
| 15-minute STEL | 0.006 mg/m³ |  |

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **MDHS 91/2** / Metals & metalloids by XRF / [Method document (opens in a new tab)](http://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs91-2.pdf) | Active (pump) | IOM with 0.8µm MCE filter | XRF | [225-70A](https://analyt-mtc.com/catalog/product/haz-dust-7204-particulate-monitor/#part-225-70a) / [225-19](https://analyt-mtc.com/catalog/product/mixed-cellulose-ester-membrane-filters/#part-225-19) / [225-1930](https://analyt-mtc.com/catalog/product/mixed-cellulose-ester-membrane-filters/#part-225-1930) |

Methods and limits as published by their agencies and summarised by SKC; check the current method and the limit that applies to you before sampling.

Source: [SKC Ltd (UK), Hazard Search, used with SKC's permission (opens in a new tab)](https://www.skcltd.com/hazard-search.html); [SKC Inc. (USA), Sampling Guides, used with SKC's permission (opens in a new tab)](https://international.skcinc.com/sampling-guides/)