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NG28 provides water quality nutrient chemical analysis services related to quality control samples, which are mainly used for method verification and confirmation, quality assurance of the testing process, etc., and can be used for blind samples of regulatory agencies on-site review, supervisory review, re-assessment and unannounced inspections. It can be used for accused samples or blind samples of laboratory internal audit, daily quality supervision, quality assessment, personnel assessment, method comparison, personnel comparison, and equipment comparison.

NG28 provides water quality organic pollution comprehensive index chemical analysis services related to quality control samples, which are mainly used for method verification and confirmation, quality assurance of the test process, etc., and can be used for blind samples for on-site review, supervisory review, reassessment and unannounced inspections by regulatory agencies It can also be used for accusation samples or blind samples such as laboratory internal audit, daily quality supervision, quality assessment, personnel assessment, method comparison, personnel comparison, and equipment comparison.

NG28 provides water quality heavy metal chemical analysis services related to quality control samples, which are mainly used for method verification and confirmation, quality assurance of the test process, etc., and can be used for blind samples of regulatory agencies on-site review, supervisory review, reassessment, and unannounced inspections. Charge samples or blind samples used for laboratory internal audit, daily quality supervision, quality assessment, personnel assessment, method comparison, personnel comparison, equipment comparison, etc.