共查询到6条相似文献，搜索用时 15 毫秒
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环境中的氮素既是生命元素,也是环境的主要污染因子。岩溶地区土层浅薄,缺少天然的防渗和过滤层,地表污染物很容易通过落水洞等地表岩溶形态进入含水层,因此岩溶水易受污染。近年来,随着现代农业和工业的不断发展,大量化肥、农家肥的使用,化粪池以及工业污水的任意排放,致使岩溶区地下水硝酸盐污染问题日益严重。文章以岩溶区典型地下河-官村地下河为例,分析检测不同月份地下河水中的NO3-浓度。实验结果显示,地下河水中的NO3-季节性变化明显,NO3-浓度在9月份(秋季)达到最大值3.55mg/L,最低浓度值出现在3月份(春季)1.23mg/L,极差值为2.32mg/L,秋季是春季浓度的2.88倍。 相似文献
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The removal of mercury from dilute solutions of mercuric nitrate by mercuric sulfide is indicative of an adsorption process. The relation of log vs. log C shows that the Freundlich adsorption isotherm exists.At higher concentrations of mercuric nitrate a reaction takes place with the mercuric sulfide forming a compound of the possible formula 2HgS·Hg(NO3)2 mercuric nitratodisulfide. 相似文献
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A silver nitrate test is described for the quantitative determination of residual hypo in photographic prints. The hypo is converted in situ to silver sulfide, the transmission density of the sulfide determined, and the hypo content obtained by reference to a standard curve.The method used to establish the standard curve is outlined, the data being verified by quantitative analyses.A simplified procedure is suggested involving the application of a drop of silver nitrate to the back of the print and then matching the spot visually with a set of standards. 相似文献