GB/T 4325.4-2013Methods for chemical analysis of molybdenum - Part 4: Determination of tin content - Atomic fluorescence spectrometry (English PDF)

3.1

of sodium borohydride.

3.2

sodium hydroxide.

3.3

molybdenum substrate (wSn<=0.00002%).

3.4

nitric acid (rho = 1.42g/mL).

3.5

hydrochloric acid (rho = 1.19g/mL).

3.6

sulfate (rho = 1.84g/mL).

3.7

Hydrogen peroxide.

3.8

sulfate (11).

3.9

Sodium hydroxide solution (200g/L).

3.10 L- cysteine (5g/L). Weigh 0.5g L- cysteine dissolved in water is added 1mL hydrochloric acid (3.5), water to the

100mL.

3.11 tartrate solution

400g/L, now with the current.

3.12 Storage tin standard solution

Weigh 0.1000g bismuth (wSn>=99.99%) in 250mL beaker, add 50mL of hydrochloric acid (3.5), plus

Cover the surface of the dish, allowed to stand overnight, until completely dissolved before adding tin 50mL hydrochloric acid (3.5), and then moved into 1000mL volumetric flask, diluted with water to

Engraved lines. This solution 1mL containing 100µg tin.

3.13 tin standard solution

Pipette 1.00mL standard stock solution of tin in 100mL volumetric flask, was added 10mL of hydrochloric acid (3.5), washed with water

Dilute to volume, and mix. This solution 1mL containing 1µg tin.

3.14 a solution of sodium borohydride (15g/L)

Weigh 1.5g of sodium borohydride (3.1), previously dissolved was added 0.5g of sodium hydroxide (3.2) in 100mL

Water, completely dissolved shake up, now with the current.

3.15

hydrochloric acid (19).

3.16

Argon, the volume fraction of not less than 99.99%.