Steps

Solid Samples

Liquid Sample

Take 30 g samples respectively, dry under 105˚C, and seal for analysis.

A

Extraction method of water-soluble mercury A. Take 10 g sample of desulfurized fly ash and add it to 200 ml deionized water, mix and shock for 30 min under constant temperature, keep static for 2 h, filtrate and separate residue and filter liquor. The Ay of filter liquor is to be measured.

Residue drying

Ay

B

Extraction method of acid-soluble mercury B. To add residue of A to 150 ml 20 mol/L HCI, shake drastically, set down for 5 min and add it to 10 ml 1% of CuSO₄ solution, mix and shock for 30 min under constant temperature, keep static for 2 h, filtrate and separate residue and filter liquor. The By of filter liquor is to be measured.

Residue drying

By

C

Extraction method of hydrogen peroxide mercury C. To add residue of B to 100 ml 30% of H₂O₂, add 10 ml concentrated HCI, keep static for 8 h, filtrate and separate residue and filter liquor. The Cy of filter liquor is to be measured.

Residue drying

Cy

D

Extraction method of lattice mercury D. To add residue of C to 40 ml aqua regia, keep it digested for 8 h, filtrate and separate residue and filter liquor. The Dy of filter liquor is to be measured.

Dy