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应用微波消解技术进行了农药废水测定总磷的研究,考察微波消解方法的消解时间、功率对消解的影响,并将该方法与GB11893—1989《钼酸铵分光光度法》中规定的消解方法进行比较.实验证明,微波消解法操作简便,测定结果准确可靠. 相似文献
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通过微波消解法、标准测试方法(SMT)和碱熔法分别测定了水系沉积物成分分析标准物质GBW07307a(GSD-7a)中的总磷(TP)含量,并分别采用3种方法对采集于黄河流域甘宁蒙段表层沉积物样品进行TP含量和样品加标回收率的测定。结果表明:测定标准物质的相对误差绝对值:微波消解法碱熔法SMT法;变异系数:微波消解法碱熔法SMT法。同时,微波消解法提取的表层沉积物TP含量的范围为634.3~909.2μg/g;SMT法TP含量的范围为627.1~889.5μg/g;碱熔法TP含量的范围为559.1~784.8μg/g。微波消解法的测定结果相对偏高,SMT法的测定结果相对偏低。样品加标回收率平均值:微波消解法SMT法碱熔法;变异系数:微波消解法碱熔法SMT法。综合测定标准物质中TP含量以及样品加标回收率实验结果的准确度和精密度,对于黄河甘宁蒙段表层沉积物,使用SMT法提取TP较优于微波消解法和碱熔法。 相似文献
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提出一种用微波消解技术作为测定水和废水中总磷的预处理方法,这种消解方法只需10min即可,比用常规的高温高压消解法节省三分之一时间。用这身份种消解法对标样、地表水、海水、生活污水和工业废水样品进行了对比测定,所得结果经统计检验,两方法之间无显著性差异。对微波消解法的精密度和准确度进行了验证。 相似文献
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采用密闭微波消解-火焰原子吸收光谱法对洞庭湖区芦苇笋中的镉进行了测定.结果表明,密闭微波消解是一种非常有效的植物样品前处理方法,对国家标准物质灌木枝叶的测定结果与推荐值吻合,表明该方法准确可靠. 相似文献
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采用石墨炉原子吸收光谱法测定农产品中痕量铍,比较了微波消解和电热板消解两种前处理方法,选择了基体改良剂。方法在0μg/L—4.00μg/L范围内线性良好,微波消解法和电热板消解法的检出限分别为0.002mg/kg和0.0002mg/kg,标样平行测定的RSD为2.4%—4.1%,农产品加标回收率为80.0%—95.0%。 相似文献
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James P. Brady Godwin A. Ayoko Wayde N. Martens Ashantha Goonetilleke 《Environmental monitoring and assessment》2015,187(5):306
Heavy metal pollution of sediments is a growing concern in most parts of the world, and numerous studies focussed on identifying contaminated sediments by using a range of digestion methods and pollution indices to estimate sediment contamination have been described in the literature. The current work provides a critical review of the more commonly used sediment digestion methods and identifies that weak acid digestion is more likely to provide guidance on elements that are likely to be bioavailable than other traditional methods of digestion. This work also reviews common pollution indices and identifies the Nemerow Pollution Index as the most appropriate method for establishing overall sediment quality. Consequently, a modified Pollution Index that can lead to a more reliable understanding of whole sediment quality is proposed. This modified pollution index is then tested against a number of existing studies and demonstrated to give a reliable and rapid estimate of sediment contamination and quality. 相似文献
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地表水总氮总磷联合消解测定方法的研究 总被引:6,自引:0,他引:6
针对目前我国文献中总氮(TN)和总磷(TP)联合消解测定的试验条件差异较大的问题,通过与标准方法对比。建立了一种地表水总氮和总磷联合消解测定的方法。当水样量为25ml时,过硫酸钾和氢氧化钠的加入质量分别为0.5g和0.12g,可同时满足2个项目的消解要求。该方法操作简单快速,可应用于地表水的检测。 相似文献
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Determination of Pb and Cd in road dusts over the period in which Pb was removed from petrol in the UK 总被引:1,自引:0,他引:1
It is commonly agreed that automobile exhaust has been the most important source of Pb pollution in urban areas, and that Cd may come from wear and tear of tyres. This study evaluates the fall in Pb concentrations in road dusts in Manchester as a consequence of the removal of Pb from petrol in January 2000. In the work presented here a slurry graphite furnace atomic absorption methodology for the determination of Pb and Cd in road dusts has been developed and is compared with an acid digestion method in terms of efficiency. The reproducibility and accuracy of the results obtained by acid digestion and the slurry method have been studied and a certified reference material CRM 038 was analysed to confirm the reliability of the proposed methods. Different factors were evaluated throughout this work including: (i) the effect of traffic density on Pb and Cd levels in road dust samples collected weekly during the period of May 1999 until September 2000; (ii) comparison between the Pb and Cd levels in a busy road and a residential street; (iii) the effect of distance from the source on Pb and Cd levels; The results of these experiments show a reduction in Pb levels over the sampling period. The relationship between road dust particle size and Pb and Cd concentration was also investigated in the 4-250 microns size range using the slurry method, showing that there is a relationship between metal concentration and particle size; the highest concentrations being for the smallest particle size. 相似文献
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Due to the consumption of the herby cheese in south eastern Anatolia-Turkey is at high ratio, chemical parameters such as
dry matter, pH, acidity, aCl, protein, fat and trace metal contents in 50 different herby cheeses produced at this region
have been determined in the presented study. The content of lead, copper, cobalt, nickel, chromium, cadmium, and iron have
been analyzed by flame atomic absorption spectrometer in air/acetylene flame after combination ash digestion method and wet
digestion method. The mean concentration of lead, copper, cobalt, nickel, chromium and cadmium in our samples are higher than
literature values except iron. 相似文献
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土壤重金属含量测定不同消解方法比较研究 总被引:19,自引:1,他引:18
消解是影响土壤重金属测定结果准确性的关键步骤.比较电热板消解、微波消解和全自动石墨消解3种消解方法的操作流程,同时对不同类型土壤样品中Cu、Zn、Pb、Cd、Cr、Ni 6种元素含量进行对比测定,结果表明,电热板消解设备简单,但步骤繁锁,操作不当易造成组分损失;微波消解速度快,测定结果精密性和准确性较好,但仍需人工赶酸程序且罐位少,不适合大批量样品分析;全自动石墨消解不仅测定结果精密性和准确性较好,而且自动化程度高,可实现无人值守,大大节省人力,尤其适合大批量样品的分析. 相似文献
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Lead and its compounds are toxic and can harm human health, especially the intelligence development in children. Accurate measurement of total lead present in drinking water is crucial in determining the extent of lead contamination and human exposure due to drinking water consumption. The USEPA method for total lead measurement (no. 200.8) is often used to analyze lead levels in drinking water. However, in the presence of high concentration of the tetravalent lead corrosion product PbO(2), the USEPA method was not able to fully recover particulate lead due to incomplete dissolution of PbO(2) particles during strong acid digestion. In this study, a new procedure that integrates membrane separation, iodometric PbO(2) measurement, strong acid digestion and ICP-MS measurement was proposed and evaluated for accurate total lead measurement and quantification of different lead fractions including soluble Pb(2+), particulate Pb(II) carbonate and PbO(2) in drinking water samples. The proposed procedure was evaluated using drinking water reconstituted with spiked Pb(2+), spiked particulate Pb(II) carbonate and in situ formed or spiked PbO(2). Recovery tests showed that the proposed procedure and the USEPA method can achieve 93-112% and 86-103% recoveries respectively for samples containing low PbO(2) concentrations (0.018-0.076 mg Pb per L). For samples containing higher concentrations of PbO(2) (0.089-1.316 mg Pb per L), the USEPA method failed to meet the recovery requirement for total lead (85-115%) while the proposed method can achieve satisfactory recoveries (91-111%) and differentiate the soluble Pb(2+), particulate Pb(II) carbonate and PbO(2). 相似文献
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两种消解法测定沉积物总磷的对比 总被引:2,自引:1,他引:1
通过过硫酸钾消解法与HClO4-H2SO4消解法对土壤和水系沉积物的标准物质,以及三峡水库沉积物未知样品中的总磷含量进行测定,并对检测结果进行对比,分析过硫酸钾消解法测定沉积物总磷的可行性。结果表明,在标准样品中,HClO4-H2SO4消解法的检测结果是标准值的83%~100%,并且所有结果均在其不确定度范围之内;过硫酸钾消解法的检测结果仅达到标准值的19%~42%,超出其不确定度范围,不能作为有效数据。在未知样品中,过硫酸钾消解法检测结果也远低于HClO4-H2SO4消解法检测结果,只达到后者的32%~52%。由此可见,过硫酸钾消解法测定沉积物或土壤中总磷,仍需要进一步的研究,以达到符合实际的检测结果。 相似文献