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<p>The calcium content is determined by titration of an aliquot portion of the test solution with ethyleneglycol-bis-(2-aminoethyl)-N,N,N',N'-tetra acetic acid, disodium salt (EGTA) solution using 2-carboxy-2'-carboxy-2'-hydroxy-5'-sulphoformazylbenzene (Zincon) as indicator. The combined magnesium and calcium contents are determined by titration of a further aliquot portion of the test solution with ethylenediaminetetra-acetic acid, disodium salt (EDTA) solution, using Mordant black 11/potassium chloride as indicator, after addition of triethanolamine solution and buffer solution. The magnesium content is calculated by difference.</p>
Reģistrācijas numurs (WIID)
13438
Darbības sfēra
<p>The calcium content is determined by titration of an aliquot portion of the test solution with ethyleneglycol-bis-(2-aminoethyl)-N,N,N',N'-tetra acetic acid, disodium salt (EGTA) solution using 2-carboxy-2'-carboxy-2'-hydroxy-5'-sulphoformazylbenzene (Zincon) as indicator. The combined magnesium and calcium contents are determined by titration of a further aliquot portion of the test solution with ethylenediaminetetra-acetic acid, disodium salt (EDTA) solution, using Mordant black 11/potassium chloride as indicator, after addition of triethanolamine solution and buffer solution. The magnesium content is calculated by difference.</p>
