Effects of Amendment on Heavy Metals in Moderately Alkaline Farmland Soil and Their Accumulation in Wheat Around Smelting Plants

doi:10.11924/j.issn.1000-6850.casb2022-0418

Abstract

Abstract:

The effect of amendment 2,4,6-trimercaptotriazine trisodium (TMT) on the accumulation of heavy metals at the late growth stage of wheat in moderately alkaline farmland around the smelting plants were investigated through field experiments. The results showed that in the contaminated soil, adding w=0.10% (mass fraction) TMT55, after 60-240 days, the available cadmium (Cd) content of DTPA in soil was reduced by 18.50%-41.53% compared with that of the controlled, and the available lead (Pb) content of DTPA in soil was reduced by 21.06%-28.43%. Adding w=0.10% (mass fraction) TMT55 to the contaminated soil with available Cd content of 0.97 mg/kg, after 200 days, the Cd content of wheat root, stem and leaf decreased by 32.04%, 27.38%, and 35.39%, respectively, compared with those of the controlled; and after 240 days, the Cd content in wheat root, stem, leaf and grain decreased by 18.12%, 34.86%, 12.39% and 20.81%, respectively. Adding w=0.10% (mass fraction) TMT55 to the contaminated soil with available Pb content of 56.72 mg/kg, after 200 days, the Pb content of the wheat root, stem and leaf decreased by 26.84%, 23.84% and 29.32% compared with those of the controlled; and after 240 days, the Pb content in wheat root, stem, leaf and grain decreased by 14.34%, 46.36%, 19.29% and 42.40%, respectively. TMT55 could inhibit the accumulation of cadmium and lead in wheat at the late growth stage, and can be a potential material for the remediation of heavy metal contaminated alkaline farmland soil around smelting plants.

Key words: 2,4,6-trimercaptotriazine trisodium (TMT), around smelting plants, moderately alkaline farmland soil, amendment, wheat, cadmium, lead

LI Hongliang, FU Yuncong, YUAN Cui, ZHU Xiaolong, GUI Juan, DAI Qingyun, HE Junqiang, DENG Lin, LIU Daihuan. Effects of Amendment on Heavy Metals in Moderately Alkaline Farmland Soil and Their Accumulation in Wheat Around Smelting Plants[J]. Chinese Agricultural Science Bulletin, 2023, 39(15): 111-117.

Figures/Tables 6

References 39

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土样来源	土壤类型	阳离子交换量/ (cmol/kg)	pH	w/(mg/kg)				w（有机质）/ (g/kg)
土样来源	土壤类型	阳离子交换量/ (cmol/kg)	pH	总Cd	总Pb	DTPA-Cd	DTPA-Pb	w（有机质）/ (g/kg)
济源	硅铝土普通褐土	9.15	7.90	2.41	185.80	0.97	56.72	15.20

土样来源	土壤类型	阳离子交换量/ (cmol/kg)	pH	w/(mg/kg)				w（有机质）/ (g/kg)
土样来源	土壤类型	阳离子交换量/ (cmol/kg)	pH	总Cd	总Pb	DTPA-Cd	DTPA-Pb	w（有机质）/ (g/kg)
济源	硅铝土普通褐土	9.15	7.90	2.41	185.80	0.97	56.72	15.20