Secondary Drinking Water Metals. 500 mL. Contains: (µg/mL) Copper, Manganese, Zinc at 50, Iron at 100 in HNO3. 12 months expiry date. Traceable to NIST SRM 31XX series. ISO 9001:2015 certified, ISO/IEC 17025:2017 and ISO 17034:20166 accredited.
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