AS ISO 13547.1:2015 pdf free

AS ISO 13547.1:2015 pdf free.Copper, lead, zinc and nickel sulfide concentrates – Determination of arsenic
Weigh 1 320,3 g of arsenic trioxide (4.2) to the nearest 0,1 mg, Transfer to a 400 ml beaker and add 5 ml of sodium hydroxide solution (4.17). Warm slightly to dissolve. When dissolution is complete, cool and add 40 ml of nitric acid (4.6). Transfer toa 1 000 ml volumetric flask containing 60 ml of nitric acid (4.6).
Fill up nearly to the mark with water, mix, and equilibrate at room temperature then fill up exactly to the mark and mix again. Store in a labelled container.
Pipette 40 ml of arsenic standard solution (4.20) into a 200 ml volumetric flask containing 2 ml hydrochloric acid (4.8). Fill up nearly to the mark with water, mix, and equilibrate at room temperature then fill up exactly to the mark and mix again. Store in a labelled glass container.
Carry out the determinations, at least in duplicate, as far as possible under repeatability conditions on each test sample.
NOTE Repeatability conditions exist where mutually independent test results are obtained with the same method on identical test material, in the same laboratory, by the same operator using the same equipment within short intervals of time.
Carry out a blank test in parallel with the analysis using the same quantities of all reagents, but omitting the test portion. The purpose of the blank test in this method is to check the quality of reagents. If a significant value is obtained as a result of the blank test, check all reagents and rectify the problem.
Transfer the test portion into a 300 ml narrow-necked conical beaker. Moisten with 5 ml of water. Add 15 ml of the saturated solution of potassium chlorate in nitric acid (4.18), cover the beaker with a watch glass, place the conical beaker on a hotplate, and heat gently until all nitrogen oxides are expelled. Add 15 ml of diluted sulphuric acid (4.11) and heat the solution until strong white fumes have evolved then cool. AS ISO 13547.1 pdf free download.