| 黄河泥沙中的腐殖质对高锰酸盐指数测定的影响 |
| 摘要点击 2839 全文点击 2662 投稿时间：2003-10-14 修订日期：2003-12-01 |
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| 中文关键词 泥沙 腐殖质 高锰酸盐指数 BOD5/sub> 黄河 |
| 英文关键词 solids humic substances CODMn BOD5 Yellow River |
| DOI 10.13227/j.hjkx.20040627 |
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| 中文摘要 |
| 通过模拟试验研究了黄河泥沙对高锰酸盐指数的影响,结果表明:①浑水高锰酸盐指数(CODMn)和水样加酸处理后水相CODMn随着泥沙含量的增加而显著增长;但水样未加酸处理水相的CODMn随着泥沙含量的增加只呈微上升趋势;②随着泥沙含量的增加,浑水生化需氧量(BOD5)的增长率显著低于浑水CODMn和加酸处理条件下的水相CODMn的增长率;③黄土中含量仅为0.76%的腐殖质对含泥沙浑水CODMn的贡献较大,当泥沙含量为7.5g/L和15g/L时,腐殖质对浑水CODMn的贡献分别为15.9%和 21.7%;④泥沙中腐殖质的主要组成之一富里酸溶于酸,当泥沙含量为7.5g/L和15g/L时,富里酸对水样加酸处理后水相CODMn的贡献分别为23.6%和50.6%.由于富里酸在自然条件下不容易发生生物降解,因此,目前黄河水质监测中的CODMn夸大了黄河耗氧性有机物的污染. |
| 英文摘要 |
| Experiments were carried out to study the influence of humic substance in solids (Loess soil) on CODMn in the Yellow River. Several significant results were abtained from the study: ① The total CODMn of water sample including liquid and solid phases increased significantly with the increase of solid content; The CODMn of liquid phase of water sample under pre-treatment with acid (LPWSPC) also increased significantly with the increase of solid content while that without pre-treatment did not increased significantly. ② With the increasing of solid content, the total BOD5 of water sample increased much slower than the total CODMn and the CODMn of LPWSPC. ③ The humic substances with the content of 0.76% in solids (Loess soil) contributed greatly to the total CODMn of water sample. When the solid contents were 7.5 g/L and 15.0 g/L, the humic substances in solids accounted for 15.9 % and 21.7 % of the total CODMn of water sample, respectively. ④ When solid contents were 7.5 g/L and 15.0 g/L, fulvic acid,one of the main compositions of humic substance contributed to 23.6% and 50.6% of the CODMn of LPWSPC, respectively. Since the fulvic acid can hardly be biologically oxidized under natural conditions, the CODMn of LPWSPC in water quality monitoring exaggerates the oxygen-consuming organic contamination of the Yellow River. |
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