Objective To assess the competence of detecting ammonia-nitrogen in water quality testing laboratories in Guangxi and ensure the safety of drinking water sources by conducting a comparison of the detection results between 52 laboratories.
Methods The results were analyzed and evaluated by robust statistical technique using quartiles.
Results The ratio of laboratories with satisfied inter-laboratory Z-score (ZB) was 84.6%, and the ratio of laboratories with satisfied innerlaboratory Z-score (ZW) was 82.7%.
Conclusion Most selected laboratories show a qualified competence in detecting ammonia-nitrogen in water.
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