calcium and magnesium in liming materials

Calcium and magnesium in liming materials EDTA titrimetric methods First action 1962 Final action 1965 (Not applicable to samples with high phosphate content or contg <2%Mg) (Caution: See safety note on eyanides) A.Reagents (a) Buffer soln. – pH 10. Dissolve 67.5 g NH 4 in 200 mL. H 2 O, add 570mL. NH 4 OH, and dil. To 1L. (b)Potassium hydroxide-potassium cyanide soln.- Disolve 280g. KOH and 66g. KCN in 1L. H 2 O. (c)Potassium cyanide soln. – 2%. Dissolve 2g. KCN in 100mL. H 2 O. (d)Eriochrome black T indicator soln. – Dissolve 0.2g indicator (HOC 10 H 6 N:NC 10 H 4 (OH)(NO 2 )SO 3 Na) (Eastman Kodak P6361, or equiv.) in 50 ml. MeOH contg 2 g NH 2 OH,HCl. Store ≤1 month. (e)Magnesium std solns.-0.25 and 1.00 mg/mL. Dissolve 0.25 and 1.00g Mg turnings in HCl (1+10) and dil. each to 1 L with double distd H 2 O. (f)Calcium std soln.

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Calcium and magnesium in liming materialsEDTA titrimetric methodsFirst action 1962Final action 1965(Not applicable to samples with high phosphate content or contg

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