ISO 4938:2016 pdf free download.Steel and iron Determination of nickel content Gravimetric or titrimetric method Aciers etfontL’s — Détei,ninution clii nickel — Métliode gruvilnétuique oil titrilnétrique. 7.2.2.2 The following applies to test portions containing more than 5 mg of copper Follow the procedure as described in 7.2.2.1 but increase the amount of dimethyiglyoxime solution (4.20) for the precipitation. Add 10 ml for each 10 mg of nickel present and add 30 ml in excess. 7.2.2.3 The following applies to test portions containing more than 5 mg of cobalt. hvaporate the test solution prepared in 7.2.1 or 7.2.2.4 to 100 ml approximately. Transfer the solution into a 600 ml beaker containing 100 ml of the ammonium citrate buffet’ solution (4.17) and 65 ml of ammonia solution After rinsing the original beaker with water, wash once with 15 ml of ammonia solution (4.13) and add the washing to the test solution. Add an amount of potassium hexacyanoferi’ate(lIl) solution (4.22) sufficient to oxidize the cobalt and manganese 1)t’esett (6 ml for each 0,1 g of cobalt and manganese) plus 10 % excess. Stir well (the solution should now be red) and, using a jH-meter .52), adjust the solution to pH 8,0 ± 0,2…