GB/T 30729-2014Determination of chlorine in solid biofuels (English PDF)

4.1 ethanol

C2H5OH, rho20 °C = 0.79g/mL.

4.2 sulfuric acid solution

(1 23) (V1 V2), the volume of pure class 1 concentrated sulfuric acid was slowly added to 23 volumes of water, and mix.

4.3 Sodium hydroxide solution

10g/L, the gifted class pure 1g of sodium hydroxide dissolved in 100mL of water.

4.4 saturated potassium nitrate solution

an amount sufficient excellent pure potassium nitrate dissolved in an appropriate amount of water, and continue until no more dissolved potassium nitrate was added, and the solution

There exists a certain amount of solid potassium nitrate.

4.5 sodium chloride standard solution

chloride ion concentration 0.20mg/mL. Weigh accurately beforehand pure class distinctions in the 500 °C ~ 600 °C for 1h burning

Sodium chloride 0.6596g, dissolved in a little water, and then transferred to 2000mL volumetric flask, dilute to the mark and shake.

4.6 silver nitrate standard solution

c (AgNO3) = 0.01411mol/L. Accurately weighed excellent pure nitric take prebaked at 110 °C after 1h

Silver 2.3969g, dissolved in a little water, and then transferred to 1000mL brown volumetric flask, dilute to the mark and shake.

4.7 bromocresol green indicator (10g/L)

Weigh 1g bromocresol green dissolved in 100mL of ethanol (95%).

4.8 Oxygen

than 99.5% purity.

4.9 quartz sand

particle size 0.5mm ~ 1.0mm.

4.10 agar

chemically pure.

4.11 porcelain boat

length 77mm, height and width of 10mm, temperature above 1100 °C.

4.12 high temperature Cotton

Cotton fiber glass or aluminum silicate cotton, temperature above 1100 °C.