This question was asked at New Brownswik, Maxxam, BV Burnaby, and CGC.
Quality Control
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Process control and trend monitoring
a) within batch control
blank, spiked blank, spike samples
b) between batch control
long term trend with stable reference materials. -
Instrument performance control and trend monitoring
troubleshooting if needed -
Data processing control
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Misc. sample ID mistakes
Quality assurance
Preventive mechanism