---
title: "o-Toluidine (95-53-4): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/o-toluidine-95-53-4/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/o-toluidine-95-53-4/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/o-toluidine-95-53-4/
---

Hazard search

# o-Toluidine

CAS number

95-53-4

Also known as

1-Amino-2-methylbenzene · 2-Aminotoluene · 2-Methylaniline · o-Methylaniline · o-Toluidine (Amines, Aromatic) · ortho-Methylaniline · Orthotoluidine

## UK workplace exposure limits

| Limit | Value | Applies to |
| --- | --- | --- |
| 8-hour TWA | 0.1 ppm |  |
| 8-hour TWA | 0.5 mg/m³ |  |

### Notations

-   Carc: carcinogen
-   Sk: can be absorbed through the skin

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **MDHS 75** / Aromatic amines by HPLC / [Method document (opens in a new tab)](http://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs75.pdf) | Active (pump) | IOM & glass fibre filter (requires coating) (or coated filter in preloaded cassette) with Tenax tube (30/15mg) | HPLC | [225-70A](https://analyt-mtc.com/catalog/product/haz-dust-7204-particulate-monitor/#part-225-70a) / [225-58F](https://analyt-mtc.com/catalog/product/glass-fibre-depth-filters/#part-225-58f) / [225-9004](https://analyt-mtc.com/catalog/product/skc-coated-treated-filters/#part-225-9004) / [226-35](https://analyt-mtc.com/catalog/product/skc-tenax-sorbent-tubes/#part-226-35) |
| **MDHS 96** / VOCs by solvent desorption and GC / [Method document (opens in a new tab)](http://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs96.pdf) | Active (pump) | Silica gel tube (150/75mg) | GC-FID | [226-10](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10) |
| **MDHS 104** / VOCs by solvent desorption and GC / [Method document (opens in a new tab)](https://www.hse.gov.uk/pubns/mdhs/pdfs/mdhs104.pdf) | Active (pump) | Silica gel tube (150/75mg) |  | [226-10](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10) |
| **NIOSH 2002** / Aromatic amines by GC-FID / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/2002.pdf) | Active (pump) | Silica gel tube (150/75mg) | GC-FID or GC-NSD | [226-10](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-10) |
| **NIOSH 2017** / Aniline, o-Toluidine, & Nitrobenzene by GC-FID / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/2017.pdf) | Active (pump) | Coated glass fibre filter in preloaded cassette with silica gel tube (520/260mg) | GC-FID | [225-9004](https://analyt-mtc.com/catalog/product/skc-coated-treated-filters/#part-225-9004) / [226-15](https://analyt-mtc.com/catalog/product/skc-silica-gel-sorbent-tubes/#part-226-15) / [225-1](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-1) |
| **OSHA 73** / o-, m- and p-Toluidine by GC-ECD / [Method document (opens in a new tab)](https://www.osha.gov/sites/default/files/methods/osha-73.pdf) | Active (pump) | Two acid-treated glass fibre filters in preloaded cassette | GC-ECD | [225-9004](https://analyt-mtc.com/catalog/product/skc-coated-treated-filters/#part-225-9004) / [225-1](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-1) |
| **Non-agency** / o-Toluidine by Colorimetric analysis | Direct-reading | Gastec detector tube |  | [810-181](https://analyt-mtc.com/catalog/product/gastec-colour-gas-detector-tubes/#part-gst-181) |

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/)