本文關(guān)鍵詞：同步輻射微區(qū)X射線熒光光譜法原位分析蚯蚓中K,Ca,Cu,Zn和Pb　出處：《分析化學(xué)》2016年05期 　論文類型：期刊論文

  更多相關(guān)文章： 同步輻射微區(qū)X射線熒光光譜法 蚯蚓 原位分析 鉛 存儲機(jī)制

【摘要】：為了研究重金屬元素在蚯蚓體內(nèi)的富集和存儲機(jī)制,使用同步輻射微區(qū)X射線熒光光譜法(μ-SRXRF)研究了K,Ca,Cu,Zn和Pb元素在生長于南京棲霞山鉛鋅礦區(qū)附近菜園土壤的蚯蚓體內(nèi)的分布特征,發(fā)現(xiàn)Pb主要富集在蚯蚓后部消化道周圍的區(qū)域,Zn,Cu在蚯蚓后部的分布規(guī)律與Pb類似,推測后部消化道周圍區(qū)域的分布是蚯蚓為了阻斷毒性重金屬元素威脅而特有的富集和存儲方式。5種元素的相關(guān)性表明,Pb和Zn相關(guān)性最高,存儲方式最為相似,Pb與K和Ca在蚯蚓后部的分布呈顯著正相關(guān),說明毒性元素Pb在蚯蚓體內(nèi)的富集和存儲過程可能伴隨著其它元素的吸收。本研究表明,μ-SRXRF在原位微區(qū)分析蚯蚓樣品的元素空間分布方面具有很大優(yōu)勢,而進(jìn)一步開展土壤及蚯蚓中Pb的形態(tài)研究,是研究重金屬脅迫下蚯蚓解毒機(jī)制的重要前提。
[Abstract]:In order to study the accumulation and storage mechanism of heavy metal elements in earthworms, the synchrotron radiation microregion X-ray fluorescence spectrometry (渭 -SRXRF-) was used to study the mechanism of accumulation and storage of heavy metals in earthworms. The distribution characteristics of Zn and Pb elements in the soil of vegetable garden near Qixia Mountain, Nanjing, China. It is found that Pb is mainly concentrated in the area around the digestive tract of the back of earthworm. The distribution of Cu in the back of earthworm is similar to that of Pb. It is inferred that the distribution of the surrounding area of the posterior digestive tract is the characteristic enrichment and storage mode of the earthworm in order to block the threat of toxic heavy metal elements, which indicates that the correlation between Pb and Zn is the highest. The distribution of Pb, K and Ca in the back of earthworm was significantly positive correlation. It is suggested that the accumulation and storage process of toxic element Pb in earthworm may be accompanied by the absorption of other elements. 渭 -SRXRF has great advantages in analyzing the spatial distribution of elements in earthworm samples in situ, and further studies on the morphology of Pb in soil and earthworm have been carried out. It is an important premise to study the detoxification mechanism of earthworms under heavy metal stress.
【作者單位】： 中國地質(zhì)調(diào)查局南京地質(zhì)調(diào)查中心;國家地質(zhì)實(shí)驗(yàn)測試中心;中國地質(zhì)大學(xué)(北京);
【基金】：國家自然科學(xué)基金項(xiàng)目(Nos.20775018,41201527) 國家高新技術(shù)研究發(fā)展計(jì)劃863項(xiàng)目(No.2007AA06Z124) 中國地質(zhì)調(diào)查局地質(zhì)大調(diào)查項(xiàng)目(No.12120113015200) 國家科技專項(xiàng)“汶川地震斷裂帶科學(xué)鉆探工程”0008課題和0003課題第四專題的聯(lián)合資助~~
【分類號】：X835;O657.34
【正文快照】： 1引言近年來,Pb等具有潛在毒性的重金屬元素污染問題日益增多,對環(huán)境和人類存在極大的生態(tài)暴露風(fēng)險[1]。特別是因礦山開發(fā)引起的環(huán)境問題,受到了廣泛關(guān)注[2,3]。隨著研究的深入,生物對重金屬的耐性機(jī)制或解毒機(jī)理,引起研究者們廣泛關(guān)注。楊紅霞等[4]用LA-ICP-MS對Cd超富集植物

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