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See Chinese contents: GB/T 11446.7-2013 GB/T 11446.7-2013: Test method for trace anion in electronic grade water by ion chromatography
This Part of GB/T 11446 specifies ion chromatography test method, for the trace amounts of fluoride ion (F-), chloride ion (Cl-), nitrite ion (NO2-), bromide ion (Br-), nitrate ion (NO3-), phosphate ion (PO43-), sulfate ion (SO42-), in electronic grade water. This Part is applicable to the determination of trace amounts of fluoride ion, chloride ion, nitrite ion, bromide ion, nitrate ion, phosphate ion, sulfate ion, in electronic grade water. The detection limit is 0.7 ??g/L, 0.8 ??g/L, 1 ??g/L, 1 ??g/L, 1 ??g/L, 1 ??g/L, 1 ??g/L, respectively.
