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chemical oxygen demand cod reagent 1% w

electrode filling solutiondouble junct

ph buffer solution ph 7.000 (yellow) +

sodium sulphite 5% zero dissolved oxyge

0.1% ammonium chloride resistivity solut

0.2 m sodium phosphate mobile phase buff

0.25 mg/l c nist sucrose calibration sta

0.25% potassium permanganate

0.2m phosphate buffer ph7.50 + 0.2

0.3% hydrogen peroxide

0.3% hydrogen peroxide

0.5 mg/l c from nist sucrose calibration

0.5 mg/l c from sodium dodecylbenzene su

0.5 mg/l c from usp 1,4-benzoquinone

0.5 mg/l c from usp 1,4-benzoquinone

0.5 mg/l c from usp 1,4-benzoquinone

0.5 mg/l c from usp 1,4-benzoquinone

0.5 mg/l c from usp 1,4-benzoquinone