GB/T 4325.26-2013Methods for chemical analysis of molybdenum - Part 26: Determination of aluminium, magnesium, calcium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, arsenic, cadmium , tin, antimony, tungsten, lead and bismuth contents - Inductively coupled plasma mass spectrometry (English PDF)

3.1

nitric acid (11, pure class distinctions).

3.2

hydrochloric acid (11, pure class distinctions).

3.3

Hydrofluoric acid (p of about 1.16g/mL, MOS level).

3.4

Sodium hydroxide (excellent pure).

3.5 Sodium hydroxide solution (100g/L)

Weigh 100g of sodium hydroxide (3.4), placed in 150mL beaker, add water 50mL, heated to

Completely dissolved, after cooling transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution of 10% sodium hydroxide solution.

3.6 Magnesium standard stock solution

Weigh 1.0000g of magnesium metal (wMg>=99.99%), placed in a beaker of 150mL, 20mL of hydrochloric acid was added (3.2), heated until completely dissolved, heated to boiling, cooled and transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution

1mL 1mg containing magnesium.

3.7 Calcium standard stock solution

Weigh 2.4971g of calcium carbonate (wCaCO3>=99.99%, previously at 105 °C ~ 110 °C drying to constant weight),

Placed in 300mL beaker, add 20mL water, was added dropwise hydrochloric acid (3.2) until completely dissolved, then was added 10mL of hydrochloric acid (3.2), boiled to remove

Carbon dioxide, cooled and transferred to plastic 1000mL volumetric flask, dilute with water to volume, and mix. 1mL solution containing 1mg calcium.

3.8 Chromium standard stock solution

Weigh 3.7349g potassium chromate (wKCrO4>=99.99%, pre-baking 1h at 105 °C), placed in 150mL

Beaker, add water to dissolve 20mL, 10mL was added nitric acid (3.1) and transferred to 1000mL volumetric flask, dilute with water to volume, and mix.

This solution 1mL 1mg containing chromium.

3.9 iron standard stock solution

Weigh 1.0000g metallic iron (wFe>=99.99%), placed in 150mL beaker, add 30mL of nitric acid (3.1), heated to dissolve completely and then heated to remove nitrogen dioxide, remove the cooled and transferred to 1000mL volumetric flask, dilute to the mark with water, shake uniform. 1mL solution containing 1mg iron.

3.10 Manganese standard stock solution

Weigh 2.7474g of manganese sulfate (excellent pure), placed in 150mL beaker, add a small amount of water dissolved, shift

Into 1000mL volumetric flask, dilute with water to volume, and mix. 1mL solution containing 1mg manganese.