Aug 01, 2019 · Finally, referencing an ultra-pure low level turbidity standard, such as a blank, while testing samples will help preserve and verify a good low level calibration testing program. References 1) U.S. EPA, Long Term 1 Enhanced Surface Water Treatment Rule, Final Rule, 40 CFR Part 9, 141 and 142,Vol. 67, No. 9, P. 1814, EPA 815-z, January ...
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