---
title: "o-Tolidine (119-93-7): exposure limits and sampling"
url: https://analyt-mtc.com/tools/hazard-search/o-tolidine-119-93-7/
lang: en
alternates:
  en: https://analyt-mtc.com/tools/hazard-search/o-tolidine-119-93-7/
  de: https://analyt-mtc.com/de/tools/gefahrstoffsuche/o-tolidine-119-93-7/
---

Hazard search

# o-Tolidine

CAS number

119-93-7

Also known as

3,3'-Dimethylbenzidine · ortho-Tolidine

## UK workplace exposure limits

Our data hold no UK limit for this substance.

## Sampling methods

| Method | Sampling | Medium | Analysis | Part numbers |
| --- | --- | --- | --- | --- |
| **NIOSH 5013** / o-Tolidine-based dyes by HPLC/UV / [Method document (opens in a new tab)](http://www.cdc.gov/niosh/docs/2003-154/pdfs/5013.pdf) | Active (pump) | 5µm PTFE filter in cassette |  | 225-17A / [225-3LF](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-3lf) / [225-1](https://analyt-mtc.com/catalog/product/aluminium-respirable-dust-cyclone/#part-225-1) |
| **OSHA 71** / o-Dianisidine, 4.4-Methylenebis(2-chloroaniline), and o-Tolidine by GC-ECD / [Method document (opens in a new tab)](https://www.osha.gov/sites/default/files/methods/osha-71.pdf) | Active (pump) | Coated 37mm glass fibre filters in 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) |

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/)