1007180001 · Merck
BOD Standard (analogous to EN ISO 5815-1) for 10 x 1l standard solution 198 ± 40 mg/l
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1250230100 · Merck
Ammonium Standard Solution, CRM traceable to SRM from NIST 1.00 mg/L NH₄-N in H₂O
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1322270100 · Merck
Ammonium Standard Solution, CRM traceable to SRM from NIST 0.250 mg/l NH₄ in H₂O
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