排序方式： 共有95条查询结果，搜索用时 156 毫秒
61.
Sial RA Chaudhary MF Abbas ST Latif MI Khan AG 《Journal of Zhejiang University. Science. B》2006,7(12):974-980
Of 6634 registered industries in Pakistan, 1228 are considered to be highly polluting. The major industries include textile, pharmaceutical, chemicals （organic and inorganic）, food industries, ceramics, steel, oil mills and leather tanning which spread all over four provinces, with the larger number located in Sindh and Punjab, with smaller number in North Western Frontier Province （NWFP） and Baluchistan. Hattar Industrial Estate extending over 700 acres located in Haripur district of NWFP is a new industrial estate, which has been developed with proper planning for management of industrial effluents. The major industries located in Hattar are ghee industry, chemical （sulfuric acid, synthetic fiber） industry, textile industry and pharmaceuticals industry. These industries, although developed with proper planning are discharging their effluents in the nearby natural drains and ulti- mately collected in a big drain near Wah. The farmers in the vicinity are using these effluents for growing vegetables and cereal crops due to shortage of water. In view of this discussion, there is a dire need to determine if these effluents are hazardous for soil and plant growth. So, effluents from different industries, sewage and normal tap water samples were collected and analysed for pH electrical conductivity （EC）, total soluble salts （TSS）, biological oxygen demand （BOD）, chemical oxygen demand （COD）, total nitrogen, cations and anions and heavy metals. The effluents ofghee and textile industries are highly alkaline. EC and TSS loads of ghee and textile industries are also above the National Environmental Quality Standards （NEQS）, Pakistan. All the effluents had residual sodium carbonates （RSCs）, carbonates and bicarbonates in amounts that cannot be used for irrigation. Total toxic metals load in all the effluents is also above the limit i.e. 2,0 mg/L. Copper in effluents of textile and sewage, manganese in ghee industry effluents and iron contents in all the effluents were higher than NEQS. BOD and COD values of all the industries are also above the NEQS. On the whole, these effluents cannot be used for irrigation without proper treatment otherwise that may cause toxicity to soil, plants and animals as well add to the problems of salinity and sododicity. Similarly, these effluents cannot be used for fish farming. 相似文献
62.
对黄山175例居民头发中锌、铜、钙、镁、钼、和硒进行了测定，锌、铜、钙、镁、钼、硒的含量分别为141．51μg／g，8．05μg／g，720．10μg／g，59．76μg／g，59．04μg／g和0．196μg／g。 相似文献
63.
悬浮液进样火焰原子吸收光谱法测定百合中的锌和锰 总被引：1，自引：0，他引：1
将处理后的百合研磨成粒度小于0.1 mm的粉状物,加入稳定剂琼脂制成悬浮液,用LaCl3消除相关化学干扰,采用标准加入法在同一试液中利用空气—乙炔火焰原子吸收光谱法测定锌和锰元素含量.结果表明,兰州百合中Zn和Mn的含量分别是162.02μg.g-1、4.95μg.g-1,且Zn和Mn的加标回收率分别为99.35%~112.60%、92.00%~101.50%.以传统湿法的测定结果为参考对测定值进行t检验,发现两者无显著性差异,说明悬浮液进样法的测定结果准确可靠. 相似文献
64.
对ZnCl2 在盐酸介质中的相平衡进行了研究 ,结果表明该体系的溶度曲线由两支构成 ,它们分别与ZnCl2 ·H2 O·0 5HCl、ZnCl2 相对应。 相似文献
65.
纳米氧化锌微乳液法的研制和表征 总被引：5，自引：0，他引：5
用微乳液法研制出纳米氧化锌 ,用透射电子显微镜观测其平均粒径约为 10 nm。并与固相反应法研制的纳米氧化锌进行了比较 相似文献
66.
在水溶液中Zn（Ⅱ）与硫氰酸铵、氯化十六烷基吡啶二甲基苄基铵形成不溶于水的三元缔合物，在少量氯化钠存在下，分相过程中Zn（Ⅱ）被定量浮选，可实现Zn（Ⅱ）与Fe（Ⅲ）、Al（Ⅲ）、Co（Ⅱ）、Ni（Ⅱ）、Mn（Ⅱ）等离子分离． 相似文献
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68.
目的：了解襄樊地区大专学生膳食中铜、锌、锰、铁的营养状况，并有针对性地进行膳食指导。方法：对襄樊地区1230名在校生进行了膳食调查，以学生每日进食量对照表测定五种食物中铜锌锰铁的平均含量对在校生铜锌锰铁日摄入量水平进行估算。参照中国营养学会推荐的每日膳食中营养素供给标准、营养与食品卫生学第三版微量元素供给标准，对大专学生膳食中铜、锌、锰、铁的营养状况作出评价。结果：男女学生每日铜摄入量分别达供给标准（RDA）132％和122％；锰日摄入量分别达RDA141％和126％；铁日摄入量分别达RDA106％和74％；锌日摄入量分别达RDA45％和41％。结论：女生铁的摄入不足，男女生锌的摄入严重不足。 相似文献
69.
本以“甲醇—氨”为溶剂，用费休氏法对磺胺嘧啶锌的水分进行了测定。方法快速、结果准确，优于常规费休氏法。为类似有机金属药物中水分的测定提供了新的方法。 相似文献
70.
李志敏 《安阳师范学院学报》2006,(2):84-85
研究了在乳化剂OP存在下,2-(3,5-二氯-2-吡啶偶氮)-5-二甲氨基酚(简称3,5-diCl-DMPAP)测定锌(Ⅱ)的显色新体系。结果表明:在pH 6.0-10.0的酸度范围内,锌(Ⅱ)与试剂形成1:2的紫红色络合物。络合物的最大吸收波长位于565 nm处,表观摩尔吸光系数为1.2×105L.mol-1.cm-1,锌质量浓度在0-6.0μg/10mL范围内遵守比尔定律,方法操作简便,灵敏度高,用于镁合金中微量锌的测定,结果满意。 相似文献