Water quality chemical oxygen demand ammonia nitrogen total phosphorus BCOD total nitrogen ph formaldehyde standard sample assessment quality control blind sample solution with certificate
Institute of Standard Samples, Ministry of Environmental Protection
Origin:
Chinese mainland
Color Classification:
Ammonia nitrogen water standard sample Total phosphorus water standard sample Total nitrogen water standard sample Chemical oxygen demand COD water standard sample Formaldehyde water standard sample Formaldehyde standard solution 100mg l Volatile phenol water standard sample
product name:
water quality standard
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