Scientific Approach – Technical Expertise – Practical Solutions


PT Schemes entail the organisation, development and evaluation of tests of the same items or similar items by several laboratories, according to predefined conditions.


We can prepare reference materials in batches from 20kg – 1000kg, depending on the client’s requirements and application.


ISO 17043

Qotho is SANAS ISO 17043 Accredited for Proficiency Schemes.


ISO 17034

Qotho is SANAS ISO 17034 Accredited for Reference Material.

Latest News

Proven proficiency benefits operations

Globally, low commodity prices are putting pressure on mining companies to ensure that all aspects of their operatio ...

Vanadium Chemicals

Vanadium Chemicals: new PT Scheme as of October 2021 ...

Heavy Mineral Sands

Heavy Mineral Sands: new PT launch – March 2022 ...

PT Schemes have a Global Reach

Currently servicing over 196 laboratories in Africa and various International countries     ...

We have Moved!

36 Pelindaba Road, Broederstroom, Madibeng, North West Province, 0240 PO Box 13, Broederstroom, 0240, South Afr ...

ISO 17034 Accredited Certified Reference Material Producer

In the analytical chemistry field, certified reference materials are used as standards that are inserted as blind sample ...