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Method for determining background values of heavy metal elements in lake or reservoir sediments
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A heavy metal, background value technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as high cost, difficult, inaccurate background value of heavy metal elements, etc.
Active Publication Date: 2016-02-24
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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[0005] In view of this, an embodiment of the present invention provides a method for determining the background value of heavy metal elements in lake or reservoir sediments, the main purpose of which is to solve the inaccurate, difficult and costly determination of the background value of heavy metal elements in lake or reservoir sediments high problem
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Embodiment 1
[0041] Determine the background values of 6 heavy metal elements chromium, nickel, copper, zinc, mercury and lead (Cr, Ni, Cu, Zn, Hg and Pb) in the sediments of Danjiangkou Reservoir:
[0042] Based on the 30×30m digital elevation model (DEM) of the surrounding area of Danjiangkou Reservoir, using the spatial analysis module in the geographic information system (ArcGIS), specifically the watershed analysis submenu in the hydrological analysis of the above spatial analysis module, Calculate the watershed boundary of Danjiangkou Reservoir, which specifically includes Xixia County, Xichuan County and Neixiang County in Nanyang City, Henan Province, Shiyan City District, Zhuxi County, and Yunxi County in Shiyan City, Hubei Province , Yun County, Zhushan County, Fang County and Danjiangkou City;
[0049] Determine the background values of 8 heavy metal elements chromium, nickel, copper, zinc, arsenic, cadmium, mercury and lead (Cr, Ni, Cu, Zn, As, Cd, Hg and Pb) in the sediments of Longyangxia Reservoir; according to the above The measurement principle and measurement method of the embodiment obtained the background values of heavy metals Cr, Ni, Cu, Zn, As, Cd, Hg and Pb in the surface sediment of Longyangxia Reservoir to be 21.44mg / kg, 17.34mg / kg, 13.13mg / kg respectively. kg, 25.40mg / kg, 8.07mg / kg, 0.14mg / kg, 0.028mg / kg and 17.16mg / kg.
[0050] It can be seen from Examples 1-2 that the background value of heavy metal elements in lake or reservoir sediments can be accurately, scientifically, simply and conveniently detected by the method of the present invention at a relatively low cost.
[0051] Specifically, because the embodiment of the present invention conducts a reasonable and comprehensive analysis and screening of the sampling area or sampling point before ...
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Abstract
The invention discloses a method for determining background values of heavy metal elements in lake or reservoir sediments, relates to the field of ecological risk evaluation, and aims at solving the problem that the heavy metal elements in lake or reservoir sediments are high in background value difficulty, high in cost and incorrect in measured background values. The method comprises the following steps: determining the boundary ranges of lake or reservoir drainage basins; dividing the lake or reservoir drainage basins into sub-drainage basins and determining outlets of the sub-drainage basins; collecting superficial sediments at the outlets of the open areas and heavy metalpollution source-free sub-drainage basins of the lakes or reservoirs as sampling samples; detecting the contents of heavy metal elements in the pre-processed samples to obtain original data; and carrying out regression analysis on the original data, selecting the data in confidence intervals as background value calculation data, and obtaining the background values of the heavy metal elements in the lake or reservoir sediments according to the distribution rule of the background value calculation data. The method provided by the invention is simple, convenient and low in cost; and the obtained background values of the heavy metal elements in the sediments are correct and scientific.
Description
technical field [0001] The invention relates to the fields of environmental standard formulation and ecological risk assessment, in particular to a method for determining the background value of heavy metal elements in lake or reservoir sediments. Background technique [0002] Ecological risk assessment is the process of assessing the possibility of adverse ecological consequences after the ecosystem is affected by one or more stress factors; the ultimate purpose of ecological risk assessment is to obtain a risk value for environmental decision-making or related The establishment of standards or benchmarks provides a reference; especially for the research on the background value of heavy metals. Heavy metals are elements that make up the earth's crust. The migration cycle between the pedospheres is widely distributed in soil, atmosphere, water bodies and organisms; the determination of the background value of heavy metals is the basis and premise for the study and evaluation...
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