峨眉山市和夾江縣茶園土壤及茶葉重金屬污染評價

發布時間:2019-09-02 來源: 短文摘抄 點擊:

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  摘要 [目的]研究峨眉山市和夾江縣茶園土壤及茶葉Cu、Cr、Cd、Pb、As和Hg 6種重金屬含量,并進行污染評價。[方法]采用原子吸收分光光度法測定重金屬Cu、Cr、Cd、Pb的含量以及原子熒光分光光度法測定As、Hg的含量,以《土壤環境質量標準GB 15618—1995》為依據,采用單因子污染指數和綜合污染指數對茶園土壤樣品進行評價。[結果]Cu、Cr、Cd、Pb、As、Hg的平均含量分別為30.59、67.08、0.35、24.15、13.32、0.13 mg/kg,根據國家標準GB 15618—1995土壤環境質量二級標準值,Cd處于臨界水平,而重金屬Cu、Cr、Pb、As、Hg的單項污染指數均小于1.0,屬于安全級別。以GB 2762—2012、NY 659—2003、NY/T 288—2012為依據,5個采樣點茶園茶葉原料樣品中的Cu、Cr、Cd、Pb、As、Hg的含量均遠低于國標或部頒的最高含量限值。[結論]峨眉山市和夾江縣區域茶葉中重金屬是安全的,符合國家標準。
  關鍵詞 土壤;茶葉;重金屬;土壤污染評價
  中圖分類號 S506 文獻標識碼 A 文章編號 0517-6611(2016)32-0123-03
  Pollutim Evaluation of Heavy Metals in Soil of Tea Plantations and Tea at Emeishan and Jiajiang
  LIU Fan, LIU Ya, ZHANG Yan-qin et al (College of Chemistry,Leshan Normal Universlty, Leshan, Sichuan 614004)
  Abstract [Objective] The aim was to study heavy metal content in soil of tea plantations and tea at Emeishan and Jiajiang,and evaluate the pollution degree.[Method]Thecontent of Cu,Cr,Pb,Cd,As and Hg were determined by atomic absorption spectrophotometry and atomic fluorescence spectrometry,based on “GB15618 - 1995” of “soil environmental quality standard”, the single factor pollution index and comprehensive pollution index were used to evaluate the soil samples in tea plantation.[Result] The results showed that the average content of Cu, Cr, Cd, Pb, As,Hg were 30.59、67.08、0.35、24.15、13.32 and 0.13mg / kg in soils of the tea plantations, according to the national standard GB15618 - 1995 soil environmental quality secondary standard values, Cd in a critical level, and the single pollution index of Cu, Cr, Pb, Hg, as were less than 1.0, it belongs to the level of security. Based on GB2762-2012/NY659-2003 /NY/T288-2012 , the contentof Cu, Cr, Cd, Pb, As, Hg of tea samples of raw materialswere obtained in the five sampling point. The contents were much lower than the national standard or issued by the Department of the highest content limit. [Conclusion]The heavy metals content of Emeishan city and jiajiang county are safe and accord with national standard
  Key words Soil; Tea; Heavy metal; Soil pollution evaluation
  目前世界所發現的山茶科植物共有23屬380余種,而在我國西南的四川、云南和貴州3省有100多種。西南地區河谷縱橫,山巒起伏,海拔高低相差懸殊,且地形地貌變化多端,形成了眾多氣候差異較大的小地貌區和小氣候區,引起茶樹種類變異,從而發展進化成熱帶型大葉種茶樹、亞熱帶型中葉種茶樹與溫帶型中葉種及小葉種茶樹。被譽為“中國綠茶之都”的四川省樂山市茶園基地面積超過4萬hm2,其茶葉年總產量達2.5萬t,茶葉年產值達5.6億元,分別占全省的25%、20%、27%[1]。
  相對于其他茶葉種植區域的茶園土壤重金屬調查與分析[2-6],樂山市區域的茶園重金屬調查較少。筆者以樂山市峨眉山市和夾江縣的多處茶園為研究對象,通過對調查區域土樣和茶樣中Cu、Cr、Cd、Pb、As、Hg 6種重金屬含量進行測定,并采用Pi單項污染指數法和內梅羅綜合污染指數法評價土壤中重金屬污染程度,旨在為研究土壤中的重金屬污染程度、防治茶園土壤重金屬污染提供理論依據[3]。

相關熱詞搜索:峨眉山市 夾江縣 茶園 重金屬 土壤

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