發(fā)布時(shí)間：2018-02-24 00:42

  本文關(guān)鍵詞： 風(fēng)化土 酸度 氟化氫 地氟病 云貴川交界區(qū)　出處：《環(huán)境化學(xué)》2017年08期 　論文類型：期刊論文

【摘要】：云貴川交界區(qū)農(nóng)村流行地氟病且曾以"土"拌煤作為生活燃料的現(xiàn)象普遍,煤系地層廣泛出露且前人觀察指出當(dāng)?shù)匕杳?土"常取自煤系地層風(fēng)化土.本文以采自該區(qū)7個(gè)縣域的71件煤系地層出露風(fēng)化土為樣本進(jìn)行研究,結(jié)果表明,52%的風(fēng)化土呈酸性,pH均值為4.62(2.39—5.54,n=37);硫酸根含量顯著偏高,均值達(dá)到1778μg·g~(-1)(295—13086μg·g~(-1),n=71);氟含量總體偏高,均值達(dá)到751μg·g~(-1)(237—1764μg·g~(-1),n=71).酸性風(fēng)化土的pH與其硫酸根含量的負(fù)對(duì)數(shù)-lg C[SO2-4]成正相關(guān)(r=0.75),表明風(fēng)化土中酸的存在形式可能為酸性硫酸鹽如KHSO4或Na HSO4,而后者可能源自煤系地層中黃鐵礦的風(fēng)化.在一定條件下(燃燒),風(fēng)化土內(nèi)部的酸與氟在燃燒條件下的相互作用可能導(dǎo)致氟化氫釋放,且風(fēng)化土中氟與高硫煤在燃燒條件下相互作用可能加劇氟化氫釋放.
[Abstract]:Endemic endemic endemic fluorosis in the rural areas of Yunguichuan border area and the phenomenon of "soil" mixing coal as a fuel for daily life is common. The coal measure strata are widely exposed and the former observation points out that the local mixed coal "soil" is often taken from weathering soil of coal measure strata. In this paper, 71 samples of exposed weathered soil from 7 counties in this area are taken as samples. The results showed that the mean value of pH was 4.62U 2.39-5.54N ~ (37), the content of sulphate was significantly higher, the mean value was 1778 渭 g 路g 路g ~ (-1) ~ (-1) ~ 295-13086 渭 g 路g ~ (-1) ~ (-1), the total fluorine content was on the high side, The mean value of the acid weathered soil is 771 渭 g 路g / g ~ (-1) ~ 237-1764 渭 g 路g ~ (-1). The pH value of acidic weathered soil is positively correlated with the negative logarithmic -lg C [SO2-4] of sulphate content, indicating that the acid in weathered soil may be in the form of acid sulfate such as KHSO4 or Na _ HSO _ 4, which may be derived from pyrite in coal-bearing strata. Under certain conditions (the interaction of acids in weathered soils with fluorine under combustion conditions may lead to the release of hydrogen fluoride, Furthermore, the interaction between fluorine and high sulfur coal in weathered soil may increase the release of hydrogen fluoride.
【作者單位】： 中國礦業(yè)大學(xué)(北京)煤炭資源與安全開采國家重點(diǎn)實(shí)驗(yàn)室;中國礦業(yè)大學(xué)(北京)地球科學(xué)與測(cè)繪工程學(xué)院;四川省煤田地質(zhì)工程勘察設(shè)計(jì)研究院;
【基金】：國家自然科學(xué)基金(41371449)資助~~
【分類號(hào)】：R188
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本文編號(hào)：1528241