SULFUR DIOXIDE 6004
flasks and dilute to the mark to produce solutions containing 1 to 20 µg/mL SO 4 2 . b. Prepare sulfite standards in the same manner over the same range. c. Store working standards in tightly-capped polyethylene bottles. Prepare fresh working standards daily. d. Analyze working standards with samples and blanks (steps 8 through 10).
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