5 Component Anion Standard in H2O, (µg/mL) Fluoride at 20, Chloride at 30, Nitrate at 100, Phosphate and Sulfate/Sulphate at 150 in H2O. 12 months expiry date. Traceable to NIST SRM 31XX series. ISO 9001:2015 certified, ISO/IEC 17025:2017 and ISO 17034:2
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