本文關(guān)鍵詞：新疆溫宿縣土壤重金屬含量分布及污染風(fēng)險(xiǎn)評(píng)價(jià)　出處：《新疆農(nóng)業(yè)科學(xué)》2016年12期 　論文類型：期刊論文

  更多相關(guān)文章： 土壤 重金屬 污染評(píng)價(jià) 生態(tài)風(fēng)險(xiǎn)

【摘要】：【目的】分析新疆溫宿縣林果土壤重金屬As、Hg、Cd、Pb和Cr的含量,明確該區(qū)域的重金屬含量及分布狀況,并對(duì)其安全性進(jìn)行風(fēng)險(xiǎn)評(píng)價(jià)�！痉椒ā�2014年對(duì)溫宿縣5.33×104hm2(80萬畝)林果取樣調(diào)查,根據(jù)林果分布、樹齡及土壤特征在1 300個(gè)樣點(diǎn)中選取代表性138個(gè)樣點(diǎn),測(cè)定重金屬As、Hg、Cd、Pb和Cr的總含量。采用污染指數(shù)法和潛在生態(tài)風(fēng)險(xiǎn)指數(shù)法,結(jié)合新疆土壤背景值、國家土壤質(zhì)量二級(jí)標(biāo)準(zhǔn),進(jìn)行該區(qū)的土壤重金屬總量分析和重金屬污染評(píng)價(jià)。【結(jié)果】溫宿縣土壤重金屬,As平均含量11.96 mg/kg,Hg平均含量0.032 mg/kg,Cd平均含量0.17 mg/kg,Pb平均含量22.93 mg/kg,Cr平均含量43.38 mg/kg,且5種土壤重金屬變異系數(shù)均較小。以國家土壤環(huán)境質(zhì)量標(biāo)準(zhǔn)(二級(jí))為基礎(chǔ),各元素的污染指數(shù)污染程度排序?yàn)?AsCdCrPbHg。污染評(píng)價(jià)表明,5種重金屬元素(As、Hg、Cd、Pb和Cr)在溫宿縣土壤的單因子污染指數(shù)(Pi)中,均屬于安全等級(jí)(Pi≤1),為清潔水平;就綜合污染指數(shù)(Ps)而言,該區(qū)域的土壤重金屬元素污染程度也均屬于安全等級(jí)(Px≤0.7),為清潔水平;單因子潛在生態(tài)風(fēng)險(xiǎn)評(píng)價(jià)指數(shù)的平均值表明,溫宿縣5種重金屬的潛在生態(tài)危害排序?yàn)?Hg(77.35)Cd(42.60)As(11.03)Pb(7.96)Cr(1.01),重金屬As、Pb和Cr處于低生態(tài)風(fēng)險(xiǎn)程度(Eir40),重金屬Hg和Cd處于中生態(tài)風(fēng)險(xiǎn)程度(Eir80)。5種重金屬的綜合潛在生態(tài)風(fēng)險(xiǎn)指數(shù)的范圍為79.78~236.10,處于低生態(tài)風(fēng)險(xiǎn)程度(RI=139.94150)�！窘Y(jié)論】新疆溫宿縣土壤重金屬(As、Hg、Cd、Pb和Cr)含量均低于警戒線,污染程度均處于安全等級(jí),單因子、綜合生態(tài)風(fēng)險(xiǎn)評(píng)價(jià)也均屬于低生態(tài)風(fēng)險(xiǎn)程度,說明溫宿縣的土壤環(huán)境質(zhì)量整體良好。
[Abstract]:[objective] to analyze the contents of Pb and Cr in the forest and fruit soil of Wensu County, Xinjiang, and to determine the content and distribution of heavy metals in this area. In 2014, 5.33 脳 10 ~ 4 hm ~ 2 (800,000 mu) forest and fruit were sampled and investigated according to the distribution of forest and fruit. The age of trees and soil characteristics were determined by selecting 138 typical sites from 1 300 sites. Total content of Pb and Cr. Using pollution index method and potential ecological risk index method, combining the soil background value of Xinjiang, the national soil quality secondary standard. The total amount of heavy metals and the assessment of heavy metal pollution were analyzed in this area. [results] the average content of heavy metals and as in Wenshu County was 11.96 mg/kg. The average content of Hg is 0.032 mg / kg ~ (-1) CD 0.17 mg / kg ~ (-1) Pb is 22.93 mg/kg. The average content of Cr was 43.38 mg / kg, and the coefficient of variation of heavy metals in the five soils was small, which was based on the National soil Environmental quality Standard (grade II). The pollution index of each element is in the order of the pollution degree of 1: AsCdCrPbHg. The pollution evaluation shows that there are five heavy metal elements in the plant. In the single factor pollution index (Pii) of soil in Wenshu County, Pb and Cr belong to the safety grade of Pi 鈮，

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