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I started my PhD in air pollution monitoring in oil field . the research is based on collecting the are sample and subsequent analysis for PM and BTEX  . I am looking for the following items :

1. Air sampling pump ( low flow with measuring the volume of air )

2. Sampling kit for particulate matter  ( PM2.5 . PM5 , PM10)

3. Sampling kit for Volatile Organic Carbon ( VOC)  particularly BTEX

4. Glass filters for particulate matter ( PM2.5 . PM5 , PM10)

5. sorbent tube for VOC ( BTEX)

6. BTEX standard solution

7. carbon disulphide solvent for desorbing of the VOC ( BTEX) from sorbent tube

Please advise suppliers or research institutes

Thank You

Magdi Hamza ( magdi60@hotmail.com)