YS/T 928.4-2013 English PDF (YST928.4-2013)

This Part of YS/T 928 specifies the method for the determination of iron, calcium, magnesium, copper, zinc, silicon, aluminum and sodium content in nickel cobalt manganese composite hydrogenoxide. This Part is applicable to the determination of iron, calcium, magnesium, copper, zinc, silicon, aluminum and sodium content in nickel cobalt manganese composite hydrogenoxide. See Table 1 for the determination scope. Table 1 -- Determination Scope 2 Method Summary Use hydrochloric acid to dissolve the test portion and adopt an inductively coupled plasma atomic emission spectrometer to directly conduct the determination. In accordance with the working curve method, calculate the concentration of each element. Express the determination results in mass fraction. Element Determination Scope (w)/% YS/T 928.4-2013 www.ChineseStandard.net ? Buy True-PDF ? Auto-delivery. Page 5 of 10 3 Reagents All reagents used in this Part are of top-grade purity, and only pure water with an electrical resistivity of not less than 18.2 M? ? cm shall be used in the analysis. 3.1 Hydrochloric acid (¦Ñ = 1.19 g/mL). 3.2 Nitric acid (¦Ñ = 1.42 g/mL). 3.3 Hydrochloric acid (1 + 1). 3.4 Nitric acid (1 + 1). 3.5 Aluminum standard stock solution: weigh-take 0.2000 g of pure aluminum (wAl ? 99.99%) in a 300 mL beaker, slowly add 30 mL of hydrochloric acid (3.3), use a watch glass to cover it; at a low temperature, dissolve it, then, cool it. Use water to wash the watch glass and beaker wall. Transfer to a 1,000 mL volumetric flask, use water to dilute to the scale and mix it well. 1 mL of this solution contains 200 ?g of aluminum. 3.6 Magnesium standard stock solution: weigh-take 0.3316 g of dried magnesium oxide (wMgO ? 99.99%) in a 300 mL beaker, slowly add 30 mL of hydrochloric acid (3.3), use a watch glass to cover it; at a low temperature, dissolve it, then, cool it. Use water to wash the watch glass and beaker wall. Transfer to a 1,000 mL volumetric flask, use water to dilute to the scale and mix i...