Iron-sulfur compounded passivation agent applicable to remediation of arsenic-cadmium composite pollution in farmland soil and application of passivation agent

• Main Authors: CAI BENZHE, YU SHUANGFEI, ZHAO ZONGSHENG, CAI XIYUN, HU CANYANG, XU JIAHUI
• Format: Patent
• Language: Chinese; English
• Published: 20.08.2019
• Subjects: ADHESIVES; CHEMISTRY; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; PAINTS; POLISHES

The invention relates to an iron-sulfur compounded passivation agent applicable to remediation of arsenic-cadmium composite pollution in farmland soil and application of the passivation agent, and belongs to the technical field of farmland soil heavy metal pollution remediation. According to the passivation agent, arsenic and cadmium forms with high bioavailability in soil are extracted from a soil solid into a soil solution by using the complexing capacity of sodium thiosulfate, and then conversion of the sodium thiosulfate in the soil is utilized for fixing the cadmium; and good fixation andcombination effects of compounded zero-valent iron on the arsenic is utilized for fixing the arsenic, so that the arsenic and the cadmium can be repaired and fixed at a same time. In addition, a synergist, a dispersing agent and a adsorption water-retaining material are added, so that utilization efficiency of the reagent is improved, and fertility and fertilizer efficiency of the soil are improved. The sodium thiosulfat