Study on arsenic level in public water supply of Delhi using hydride generator accessory coupled with atomic absorption spectrophotometer   总被引：1，自引：0，他引：1  

Sanjeev Lalwani  T. D. Dogra  D. N. Bhardwaj  R. K. Sharma  O. P. Murty 《Indian journal of clinical biochemistry : IJCB》2006,21(1):70-76

Exposure to arsenic has been associated with several health hazards. Worldwide the main reason for chronic human intoxication with arsenic is intake of contaminated drinking water. Air acetylene type of atomic absorption spectrophotometer in combination with hydride generator accessory was used to analyze arsenic level in 25 water samples collected from 25 booster pumping stations and 313 water samples collected from tap water supply of 62 areas of Delhi. Results were analyzed using SPSS and Barlett’s Chi Square Test. Mean arsenic level detected in water samples collected from booster pumping stations was 0.00976 ppm (Range 0.000–0.017 ppm, Standard Deviation 0.006 and Standard error of Mean 0.00118). Maximum arsenic level (0.017 ppm) was found in water samples of booster pumping stations of Mehrauli, Punjabi Bagh and Ramjas Road. Mean arsenic level detected in samples collected from tap water supply was 0.013 ppm (Range 0–0.0430 ppm, Standard Deviation 0.00911 and Standard error of Mean 0.000515). In water samples of 42 areas arsenic level detected was exceeding WHO/EPA permissible limit of 0.01 ppm (10 ppb). The mean arsenic level detected in water samples of booster pumping station was within WHO/EPA permissible limit while mean arsenic level detected in tap water samples was marginally higher. Mixing of ground water and contamination through broken or leaking channel could be the possible reason of higher arsenic level in tap water. Continuous monitoring of quality of drinking water is required particularly in view of water contamination caused by industrial waste and uncontrolled ground water extraction.  相似文献   

High arsenic tolerance in Brevundimonas aurantiaca PFAB1 from an arsenic-rich Indian hot spring     

《Electronic Journal of Biotechnology》2021

BackgroundArsenic contamination in the ground water of rural India is a recurrent problem and decontamination is mostly based on the chemical or physical treatments until now. Microbial bioremediation is eco-friendly, cheap, time-efficient and does not produce any toxic by-products.ResultIn the present study, a high arsenic tolerant bacteria Brevundimonas aurantiaca PFAB1 was isolated from Panifala hot spring located in West Bengal, India. Previously Panifala was also reported to be an arsenic-rich hot spring. B. aurantiaca PFAB1 exhibited both positive arsenic reductase and arsenite oxidase activity. It was tolerant to arsenite up to 90 mM and arsenate up to 310 mM. Electron microscopy has proved significant changes in cellular micromorphology and stalk appearance under the presence of arsenic in growth medium. Bioaccumulation of arsenic in As (III) treated cells were 0.01% of the total cell weight, while 0.43% in case of As (V) treatment.ConclusionsAll experimental lines of evidence prove the uptake/accumulation of arsenic within the bacterial cell. All these features will help in the exploitation of B. aurantiaca PFAB1 as a potent biological weapon to fight arsenic toxicity in the near future.How to cite: Banerjee A, Sarkar S, Gorai S, et al. High arsenic tolerance in Brevundimonas aurantiaca PFAB1 from an arsenic-rich Indian hot spring. Electron J Biotechnol 2021:52. https://doi.org/10.1016/j.ejbt.2021.05.006  相似文献   

拉么锌矿选矿工艺流程初探     

梁超勇 《大众科技》2012,(1):175-177

采用部分混合优先浮选,再对铜、砷分离。实验室试验结果:铜精矿含Cu 17.29%、含Zn 4.15%、含As 0.33%,铜回收率80.21%,砷精矿含As 23.43%、砷回收率83.08%。达到初步预期效果,为后续作业提供良好条件。  相似文献   

原子荧光法测食品包装纸中砷的前处理探讨     

卢俊荣 《莆田学院学报》2013,20(2):38-40,45

通过干灰化法、Mars高通量密闭微波消解、压力自控密闭微波消解等三种前处理方法对同一种食品包装纸进行了总砷的检测,并对检测结果进行分析比较。实验结果表明干灰化法、高通量密闭微波消解法、压力自控密闭微波消解法的检出限分别为0.28ng/mL、0.09ng/mL、0.09ng/mL,精密度分别为9.97%、3.20%、4.15%,加标回收率分别为89.4%、93.7%、97.3%。经过相关比较分析,总结出前处理方法对纸制品中总砷检测的影响。  相似文献   

天然饮用水简易高效除砷方法研究   总被引：1，自引：0，他引：1  

易求实  汤发宇 《培训与研究》2002,19(2):41-45

提出了一种天然饮用水铁盐简易、高效除砷的新方法，介绍了该方法的原理，通过实验确定了影响除砷率的多方面因素。其中，提出的硫酸亚铁、漂白粉、氢氧化钠三协同作用对除砷率的影响，经检索尚未见同类报道。该方法对提高农村、山区居民饮水质量，对加强野外工作人员使用陌生水源时的安全保障，对解决突发性砷污染地区饮水问题，有其现实意义。  相似文献   

除砷技术研究现状   总被引：12，自引：0，他引：12  

梁慧锋  刘占牛 《邢台学院学报》2005,20(2):96-98

介绍含砷废水对人类的危害，阐述除砷材料和含砷废水的处理方法的发展情况，以及各种除砷技术的优缺点．总结出在各种除砷方法中生物除砷将是最有发展前景的方法。  相似文献   

微波消解氢化物发生原子荧光法同时测定农产品中砷和汞     

彭晓俊  ;卢琴芳  ;庞晋山 《九江师专学报》2008,(3):74-77

建立了微波消解氢化物发生原子荧光光谱法测定农产品中砷、汞含量的方法。研究了硼氰化钾浓度、酸度、载气流量等条件对原子荧光强度的影响。在最佳的工作条件下,对砷和汞检测的线性范围分别为0.4090μg/L～4.090μg/L、0.2026μg/L～2.026μg/L,相关系数分别为0.9984、0.9965,砷和汞的检出限分别为0.084μg/L和0.022μg/L,相对标准偏差均小于7%,符合国际上对农产品安全质量检测的要求。  相似文献   

某铜锌矿选矿小型试验研究     

苏思苹  曾庆坤 《大众科技》2012,(1):104-105,113

根据某铜锌矿矿石性质特性进行小型试验,初步探索处理该矿石的选矿工艺:采用为浮重原则流程,浮选回收铜、锌,获得最终铜精矿、锌精矿,浮选尾矿进行硫砷分离,获得硫精矿和最终砷精矿。铜锌浮选分离为流程的关键作业,试验进行了3种浮选方案比较,捕收剂以Z-200效果较好,工艺以优先有氰浮选结果较优。  相似文献   

洗氯水除砷及砷渣富集工艺研究     

李显华 《大众科技》2012,(1):149-150

含砷洗氯水可采用盐酸中和,石灰和硫酸铁两段除砷的方法处理,溶液中的砷能降至0.5mg/L以下,达到国家规定的工业污水砷排放标准。一段砷渣可采用二次富集方法提高渣含砷。  相似文献   

微波消化-氢化物原子吸收法测定羊肚菌中砷的含量     

李涛  王元忠  刘鸿高 《玉溪师范学院学报》2007,23(8):56-59

采用微波消解样品,氢化物原子吸收法测定砷含量.本法检出限为0.036μg.Kg-1,变异系数RSD=5.48%,回收率为90%~101%.该方法简单快速,灵敏度高,可作为药用真菌羊肚菌中微量砷的测定方法.  相似文献