UNEP DATABANK OF LABORATORIES ANALYZING PERSISTENT ORGANIC POLLUTANTS
"POPS LABORATORY DATABANK"

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4 Sampling According to Matrix: High Frequency (++), Low Frequency (+) 

Matrices of Interest GMP Matrices
Pesticides + DDT + HCB
The Laboratory ++ + ++ ++ ++
Other Laboratory + + ++ + ++
Client + + + ++ + + +
Nurse / Physician +
The lab. provides sampling equipment ++ ++ ++ ++ ++
The lab. specifies the sampling procedure ++ ++ ++ ++ ++ ++
Other

* Proposed as a useful matrix by GMP Group (2010)