GB/T 28732-2012Determination of total sulfur in solid biofuels (English PDF)

3.1 Method summary

The solid biomass fuels in general analysis sample and reagent mixing Ai Shika burning, all sulfur in the sample is converted to soluble sulfate, and then

After allowing ions to form sulfuric acid, barium sulfate precipitation, calculate the total sulfur content of solid biomass fuels based on the quality of barium sulfate.

3.2 Reagents and materials

Unless otherwise indicated in the analysis using only recognized as analytical reagent or distilled or deionized water or equivalent purity.

3.2.1 Ai Shika agent (hereinafter referred to as aldrin)

2 parts by mass of chemically pure light magnesium oxide (GB/T 9857) and 1 part by mass of

Studies pure anhydrous sodium carbonate (GB/T 639) was mixed and finely ground to a particle size less than after 0.2mm, kept in a sealed container.

3.2.2 hydrochloric acid solution

(11), a volume of hydrochloric acid (GB/T 622) adding a volume of water and mix.

3.2.3 barium chloride solution

100g/L, 10g of barium chloride (GB/T 652) were dissolved in 100mL water.

3.2.4 methyl orange solution

2g/L, 0.2g of methyl orange was dissolved in 100mL of water.

3.2.5 silver nitrate solution

10g/L, 1g silver nitrate (GB/T 670) was dissolved in 100mL of water, adding a few drops of nitric acid (GB/T 626), the reservoir

In a dark bottle.

3.2.6 porcelain crucible

a capacity of 30mL and 10mL ~ 20mL two kinds.

3.2.7 filter

medium-speed qualitative filter paper and the dense ash quantitative filter paper (GB/T 1914).

3.3 Equipment

3.3.1 Analytical Balance

a sense of the amount of 0.1mg.

3.3.2 muffle furnace

with a temperature control device which can heat up to 900 °C, adjustable temperature and ventilation.

3.4 Test procedure

3.4.1

in 30mL porcelain crucible weighed general analytical sample (1.00 ± 0.01) g (weighing accuracy of 0.0002g) and Aldrin (3.2.1) […]