黔西北地区土壤重金属地球化学背景及管理目标值

doi:10.11720/wtyht.2022.1077

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Abstract

Based on the heavy metal content data of 1 308 deep soil samples taken from the 1∶250 000 geochemical survey of land qualityin the Bijie area, Guizhou Province, the content distribution and geochemical background characteristics of heavy metals in soil in the area were studied. The geochemical background values of heavy metals in soil in northwestern Guizhou Provinceare significantly higher than those in soil nationwide but are close to those in soil in southwestern China. The heavy metal content in soil in northwestern Guizhou is closely related to the geological background and is significantly different between different geological units. The soil developing in Carboniferous strata has high geochemical background values of Pb and Zn, while the Middle Permian soil formed due to weathering hashigh geochemical background values of Cd and Hg. All these mean that besides heavy metal pollution in soil caused by zinc melting using indigenous methods,another important factor causing the heavy metal enrichment is the high geochemical background values of heavy metals in soil.The statistics show that the management target value of Cd in the Middle Permian weathered soil in northwestern Guizhou is higher than thecontrol value (2.0×10^-6) of Cd stipulated in the Risk Management Standard for Agricultural Land for Soil Pollution in China. It is considered that the differences in geochemical background values of heavy metals in soil between different geological units and their impacts on the ecological environment should be fully considered when determining the management target values of heavy metals in soil in northwestern Guizhou Province.

Key words： geochemical background soil heavy metals management target value Guizhou

Received: 08 February 2021 Published: 25 February 2022

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	Wei MENG
	Chun-Hu MO
	Ying-Zhong LIU

Cite this article:

Wei MENG,Chun-Hu MO,Ying-Zhong LIU. Geochemical background and management target values of heavy metals in soil in northwestern Guizhou Province[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 250-257.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1077 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/250

Distribution of the deep soil samples

The content of heavy metals in deep soil of northwest Guizhou and its management target value

Spatial distribution of As, Cd, Cr, Cu, Hg, Ni, Pb and Zn in deep soil of northwest Guizhou

元素	成土母岩地层单元	剔除前				剔除后		变化范围/10^-6	数据类型	管理目标值/ 10^-6
元素	成土母岩地层单元	平均值/10^-6	离差	最小值/10^-6	最大值/10^-6	平均值/10^-6	离差	变化范围/10^-6	数据类型	管理目标值/ 10^-6
As	三叠系	17.1	7.9	2.08	43.3	16.9	7.6	1.2~33.0	正态	33
	二叠系	11.2	2.0	1.42	167.1	10.1	1.8	2.72~45.8	对数	45.8
	石炭系	20.5	1.55	5.37	102.3	19.6	1.4	8.5~49.5	对数	49.5
	寒武系	20.3	1.52	9.73	68.8	19.5	1.4	8.8~46.8	对数	46.8
	二叠系中统	15.1	3.6	4.33	68.2	14.9	3.3	8.0~22.3	其他	22.3
Cd	三叠系	0.206	0.16	0.052	2.348	0.191	0.062	0.067~0.315	正态	0.315
	二叠系	0.430	0.249	0.019	5.872	0.390	0.209	0.02~0.927	其他	0.927
	石炭系	0.399	0.186	0.114	2.69	0.388	1.81	0.027~0.771	对数	0.771
	寒武系	0.197	0.045	0.091	0.548	0.195	0.045	0.107~0.287	其他	0.287
	二叠系中统	0.924	0.585	0.117	5.872	0.834	0.507	0.02~2.093	其他	2.093
Cr	三叠系	130.0	26.6	42.72	489.3	126.4	23.0	76.7~183.1	其他	183.1
	二叠系	158.3	1.36	74.95	396.6	156.0	1.34	85.6~293.0	对数	293.0
	石炭系	120.1	25.6	63.20	186.3	120.1	25.6	69.0~171.2	正态	171.2
	寒武系	73.9	1.18	54.67	130.9	72.5	1.14	53.1~103.0	对数	103.0
	二叠系中统	290.7	1.361	84.69	301.4	156.8	1.361	84.6~290.7	对数	290.7
Cu	三叠系	56.2	1.5	10.4	145.8	55.6	1.5	26.2~118.0	对数	118.0
	二叠系	129.1	66.1	15.0	315.4	129.1	66.1	0~261.3	正态	261.3
	石炭系	41.7	17.7	14.6	163.6	40.2	12.7	14.8~65.6	正态	65.6
	寒武系	31.9	1.5	19.7	166.9	30.2	1.2	19.5~46.8	对数	46.8
	二叠系中统	87.0	49.7	15.0	263.3	85.3	46.8	0~178.9	正态	178.9
Hg	三叠系	0.117	0.048	0.025	0.376	0.114	0.042	0.022~0.212	正态	0.212
	二叠系	0.182	0.087	0.028	2.238	0.172	0.078	0.007~0.357	其他	0.357
	石炭系	0.155	0.054	0.025	0.391	0.155	0.054	0.047~0.263	其他	0.263
	寒武系	0.141	0.023	0.071	2.643	0.138	0.037	0.094~0.187	正态	0.187
	二叠系中统	0.267	0.062	0.036	1.091	0.262	0.06	0.143~0.391	其他	0.391
Ni	三叠系	56.8	1.4	14.2	115.4	56.8	1.4	28.2~114.6	对数	114.6
	二叠系	70.0	22.0	8.77	142.6	69.3	21.0	27.3~109.3	正态	109.3
	石炭系	52.8	17.4	14.0	109.0	51.5	15.6	20.3~82.7	正态	82.7
	寒武系	37.5	1.3	27.3	75.1	35.9	1.2	24.9~51.7	对数	51.7
	二叠系中统	67.5	24.6	8.77	142.6	66.0	22.6	20.8~111.2	正态	111.2
Pb	三叠系	29.5	7.5	12.15	54.6	29.4	7.3	14.5~44.6	正态	44.6
	二叠系	27.2	1.43	9.68	221.4	26	1.32	16.8~35.9	对数	35.9
	石炭系	50.6	16.9	22.60	643.1	47.6	13.3	16.8~84.4	其他	84.4
	寒武系	39.1	8.3	23.85	547.6	38.8	8.3	22.4~55.7	其他	55.7
	二叠系中统	31.9	11.7	15.07	95.6	32	9.65	8.5~55.3	正态	55.3
Zn	三叠系	101.9	12.7	31.79	211.8	101.9	12.7	76.4~127.4	其他	127.4
	二叠系	134	21.2	32.05	403.4	133	21.2	91.5~176.5	其他	176.5
	石炭系	154.2	1.76	42.00	902.9	144.0	1.63	50.0~475.3	对数	475.3
	寒武系	99.1	87.4	47.05	466	74.9	15.4	44.1~105.7	正态	105.7
	二叠系中统	136.8	42.9	32.05	275.6	135.4	40.9	51.0~222.5	正态	222.5

Heavy metal content and management target value of weathered soil in various geological units in northwest Guizhou

Comparison of mean values of heavy metal elements in deep soil of Northwest Guizhou and different evaluation units in China

Relative change rate of As, Cd, Cr, Cu,Hg, Ni,Pb and Zn management target of deep soil weathered in different strata
1—Triassic;2—Permian;3—Carboniferous;4—Cambrian;5—middle Permian

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