GB/T 23991-2009Determination of soluble harmful elements content of coatings (English PDF)

4.1 HCl

about 37% (by mass) density of about 1.18g/mL.

4.2 hydrochloric acid solution

0.07mol/L.

4.3 hydrochloric acid solution

approximately 2mol/L.

4.4 nitric acid solution a 1

1 (volume ratio).

4.5

antimony, arsenic, barium, cadmium, chromium, lead, mercury, selenium standard stock solution. a concentration of 100mg/L or 1000mg/L.

5. Apparatus

Common laboratory equipment as well as some of the following equipment.

5.1

The detection limit appropriate (see Chapter 8) analytical instruments. such as atomic absorption spectroscopy, inductively coupled plasma atomic emission spectrometer.

5.2 crushing equipment

shredders, scissors and so on.

5.3 stainless steel metal sieve

aperture of 0.5mm.

5.4 Balance

Precision 0.1mg.

5.5 Heating and stirring device

the device should be in a constant temperature (37 ± 2) °C with continuous auto stirring, stir the outer layer should be teflon or glass

Glass. It can also be used in a constant temperature (37 ± 2) °C in shaking water bath.

5.6 pH meter

accuracy of ± 0.2pH units.

5.7 membranes (for water)

Aperture 0.45µm.

5.8 flask

25mL, 50mL, 100mL like.

5.9 Pipette

1mL, 2mL, 5mL, 10mL, 25mL, 50mL and the like.

5.10 series of chemical containers

total capacity of hydrochloric acid solution (4.2) the volume of the extraction agent 1.6 to 5.0 times.

5.11

glass or Teflon plate.

All glassware, sample containers, stirring, glass or Teflon boards are required before using a nitric acid solution (4.4) soaked

24h, then washed with water and dried.

GB/T 23987-2009 | GB/T 23988-2009 | GB/T 23993-2009 | GB/T 23987.2-2026 | GB/T 23987.3-2025 | GB/T 23981.2-2023 | […]