排序方式: 共有17条查询结果,搜索用时 93 毫秒
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白酒中铅主要来源是白酒生产过程中冷却器和贮存罐等金属器中铅的溶出,还有就是生产所用原料如稻谷、高梁、薯粉等和水受铅污染而引起的.白酒中铅含量超标主要是由于蒸馏器、冷凝器、导管和贮酒容器中的铅经溶蚀而带入,设备的铅含量越高,酒的酒度越高,则设备的铅溶蚀越大.改进蒸馏器、冷凝器、导管和贮酒容器等生产设备,采取低温入池发酵、定温蒸馏、保持适宜冷凝温度,定期刷洗蒸馏器、冷却器等方法可有效预防铅含量超标.白酒铅含量超标的解决方法有化学药物和生物技术法. 相似文献
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谭晓慧 《初中生学习(中考新概念)》2014,(Z1)
正古罗马人发达的冶金技术以及对使用金属铅的偏爱为古罗马帝国的衰败种下了可怕的祸根。他们把金属铅广泛应用于建筑、军事和装饰上。除此之外,铅还被当做贵重金属渗透到古罗马贵族生活的各个方面。铅开始被大量用于制作各种玩具、铸像、戒指、钱币、化妆品、药品和颜料。各种餐具、厨具或器皿也大量使用铅质材料。 相似文献
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Changes of root morphology and Pb uptake by two species of Elsholtzia under Pb toxicity 总被引:2,自引:1,他引:2
Elsholtzia argyi and Elsholtzia splendens, which are Chinese endemic Pb/Zn mined and Cu mined ecotype respectively, were investigated on the aspect of their response to Pb toxicity in the presence or absence of EDTA addition. After 8 d's Pb treatment, root length, root surface area and root volume of E. splendens decreased much more than those ofE. argyi, and reduced considerably with increase of Pb, while no marked change was noted for root average diameter. Compared to E. argyi, length of root with diameter (D)<0.2 mm was significantly reduced for E. splendens as Pb increased. D<0.1 mm E. splendens root had cross-sectional surface area at Pb≥10 mg/L, while for E. argyi, it was at Pb>25 mg/L. With increase ofPb, DW ofE. splendens decreased much more than that of E. argyi. E. argyi exhibited much more tolerance to Pb toxicity than E. splendens. Treatment with 100 mg/L Pb plus 50 mmol/L EDTA significantly decreased the length and surface area of D≤0.2 mm root, increased the length and surface area of 0.2≤D≤0.8 mm root for the case ofE. argyi, while for E. splendens, length and surface area of D<0.6 mm root reduced, as compared to 100 mg/L Pb treatment, alone. At 100 mg/L Pb, shoot Pb accumulation in E. splendens and E. argyi were 27.9 and 89.0 μg/plant DW respectively, and much more Pb was uptaken by the root and translocated to the stem ofE. argyi as compared to E. splendens. Treatment of the plant with 100 mg/L Pb plus 50 mmol/L EDTA increased leaf Pb accumulation from 16.8 to 84.9 g/plant for E. splendens and from 18.8 to 52.5 g/plant for E. argyi, while both root and stem Pb pronouncedly reduced for both Elsholtzia species. The increased translocation of Pb to the leaf ofE. splendens being than that ofE. argyi after treatment with 100 mg/L Pb plus 50 mmol/L EDTA should be further investigated. 相似文献
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新闻背景2006年8月末至今,甘肃省徽县水阳乡有近千人来西安进行血铅检测,373名儿童有90%的儿童血铅超标,最高者血铅含量超标数倍,被诊断为重度铅中毒,成人血铅超标也很普遍.国家环保总局派出专家调查认为,水阳乡新寺村旁的一家铅锭冶炼厂是“罪魁祸首”,公司周边400米范围内土地已全部被污染.《东方时空》、《焦点访谈》专门对此做了报道,血铅超标的病人正在接受有效治疗. 相似文献
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对安顺市区部分市场销售的松花蛋进行随机抽样,采用原子吸收分光光谱法对所抽取松花蛋样品进行重金属铅含量的分析测定。分析结果表明,所抽取的松花蛋样品中重金属铅的含量均超过了国家标准。长期食用铅含量超标的松花蛋会对人体产生严重危害,本文建议安顺市区食品安全部门加强对市场销售的松花蛋进行必要的技术监督,确保人民群众生命健康不受伤害。本文对安顺市区食品安全管理和技术监督方面具有一定的指导意义。 相似文献
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氢化物发生—原子荧光光谱法测定肥料中的铅 总被引:1,自引:0,他引:1
研究了氢化物发生—原子荧光光谱法测定肥料中的铅含量,选择了最佳检测条件.线性范围0μg/L-200.0μg/L,回收率为96.4%-100.3%. 相似文献