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Mg–Al–Fe layered double hydroxides(LDHs) were exfoliated and incorporated in polyether sulfone membranes for the removal of phosphate and fluoride for the first time. The exfoliation methods, coagulation bath, LDH amount, interfering ions, adsorption isotherm,desorption and reuse of the membranes were investigated. It was found that LDHs could be quickly exfoliated in formamide/N,N-dimethylformamide(DMF) solvent mixtures with sodium carboxymethyl cellulose as a stabilizer. The membranes displayed much higher adsorption capacity for phosphate(5.61 mg/g) and faster adsorption rate than the unexfoliated materials. With increased DMF content in the coagulation bath, the static and dynamic adsorption capacity rose. Interference from Cl-and SO_4~(2-)(50 mg/L) on adsorption of phosphates was not apparent. The membranes displayed excellent reusability in dynamic adsorption/desorption. The membranes also showed high adsorption capacity for fluorides(1.61 mg/g). 相似文献
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通过对上海市郊十个工厂附近的大气、降尘、水、土壤、蔬菜和人尿等生态因素含氟量的调查研究,证明各厂排放的氟化物对附近的蔬菜生产和人体健康都有不同程度的影响。其污染的严重程度与各厂的排放强度以及与厂外的距离有密切关系,并对污染源的治理、减少蔬菜的损失和保障人体的健康提山一些合理的建议。 相似文献
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目前,通过中国实验室国家认可委员会的实验室,按照ISO/IEC17025:2005《校准和检测实验室能力通用要求》,都要制定并实施质量控制程序以监控检测和校准的有效性,所得数据的记录方式应便于可发现其发展趋势,如可行,应采用统计技术对结果进行审查。文章利用认可准则规定的五种方法中的一种方法,就分析一个物品不同特性结果的相关性,即利用某地下水水质的监测数据对氟化物、总硬度进行一元线性回归,检验其相关性是负相关,并建立了回归方程,绘制回归直线,充分验证了监测数据的有效性和可靠性,从而证明实验室利用的质量监控方法有效。 相似文献
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Oruc N 《Environmental geochemistry and health》2008,30(4):315-323
Endemic dental fluorosis was first observed in Turkey in Isparta Province, located in the SW of Anatolia, with mottled enamel related to the high levels of fluoride (1.5–4.0 ppm) in drinking waters, about 55 years ago. The origin of fluoride was attributed to the contents of minerals in volcanic rocks, consisting of pyroxene, hornblende, biotite, fluorapatite and glassy groundmass minerals. It was also reported about 35 years ago that severe dental and skeletal fluorosis has been observed in human beings and livestock in Dogubeyaz?t and Caldiran areas, located around Tendurek Volcano in eastern Turkey, where natural waters contained fluoride levels between 2.5 and 12.5 ppm. It was hypothesised that fluoride, which might be transported by fumaroles or escaped from devitrified lavas, could be held on the surface of some minerals and then exchanged with OH- in ground waters with high pH at the foothills of the young Tendurek Volcano. Endemic dental and skeletal fluorosis was also observed in the inhabitants in Kizilcaoren Village of Beylikova Town in Eski?ehir Province situated in the midwest of Turkey, where the fluoride content of the drinking waters ranged from 3.9 to 4.8 ppm. The origin of high fluoride in the natural waters was related to the fluorspar deposits, occurring in the catchment area near the village. During the survey in the Güllü Village of Esme-Usak, located in south-midwest of Turkey, it was observed that most of the inhabitants born and raised in the village and aged between 10 and 30 years, showed mild to moderate levels of mottled enamel. The fluoride contents of the deep well waters used for drinking in the village, varied from 0.7 to 2.0 ppm. Amorphous microscopic fluorite existing in the Pliocene lake limestones was considered as a possible origin of fluoride in the waters. 相似文献
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桑叶表面氟化物吸附积累规律的统计研究 总被引:9,自引:0,他引:9
以各气象因素和大气氟化物浓度为生态因子,对大田桑园中各叶位桑叶的氟化物的吸附积累规律,进行了统计分析和研究,建立了各叶位桑叶的氟化物的吸附积累模型。 相似文献
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