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1.
冷原子荧光法是测定水中微量、痕量汞的特异方法,干扰因素较少,灵敏度较高。为减少器皿对测定样品的污染及操作上的便利,往往将水样置于比色管内,加入一定量的消解试液,进行水浴加热消解,然后在比色管中直接  相似文献   

2.
AMA254汞分析仪测定颗粒物中痕量总汞的研究   总被引:1,自引:0,他引:1  
采用AMA254汞分析仪测定大气颗粒物和煤中的痕量总汞,建立了直接测定颗粒物中痕量总汞的分析方法.测定结果表明,在汞绝对含量为0~35ng范围内线性良好,测定大气颗粒物和煤中的痕量总汞的检出限分别为0.06ng/m3和0.02ng/g,标准样品测定的RSD≤0.78%,加标回收率为92%~108%.该方法具有无需消解直接进样测定、极其简便、省时等特点,适合多种固体样品中痕量汞的测定.  相似文献   

3.
水中痕量氰化物的高灵敏冷原子吸收间接测定方法   总被引:3,自引:0,他引:3  
鉴于汞冷原子吸收光度法测定汞的高灵敏度,提出了一种间接地测定水中痕量氰化物的新方法。由于汞与CN-能生成稳定的络合物,处于化合态的汞不再被还原为原子态的乘,因而,可在不经分离的情况下,用汞冷原子吸收光度法测定剩余的汞,从而求出氰化物的含量.方法经实验证明,灵敏度高,重现性好,快速简便。  相似文献   

4.
利用DMA-80自动测汞仪直接测定海水中痕量汞   总被引:5,自引:0,他引:5  
采用DMA-80自动测汞仪直接测定海水中的痕量汞,详细介绍了干燥时间、分解温度、释放温度等分析条件的优化选择。试验结果,方法在0.4~400ng范围内线性良好,检出限为2×10-5mg/L,方法操作简单,灵敏度高,结果准确。  相似文献   

5.
总汞的多种测定方法中冷原子荧光法近年来逐步得到应用。资料对测定植物和土壤中痕量汞的冷原子荧光技术进行了较详细的讨论,由方法可知,测定食物样品中汞含量的关键是试样的消解。本文试验和比较了六种消化法在敞开或冷凝回流条件下各种溶剂消解食物对汞的测定浓度及消解率的影响,探讨了山萮酸饱和溶液的消泡效果  相似文献   

6.
冷原子吸收法测定水中痕量汞的某些条件的探讨完恩发(河南省许昌水文分站461000)测定水中痕量汞的方法很多,其中以冷原子吸收法(即冷蒸气原子吸收光度法)为最普遍。因为,此法具有灵敏度高,干扰因素少,设备简单,测定快速,重现性好等优点。根据我们多年工作...  相似文献   

7.
利用微波消解和原子荧光光度法同时测定水样中的砷、汞   总被引:5,自引:0,他引:5  
张军国 《干旱环境监测》2002,16(4):201-202,247
建立了一种梯度升压微波消解样品、氢化物原子荧光光度法同时测定水样中砷、汞的方法。在优化实验条件下,水样中砷的检出限为0.07μg/L,回收率为95.9%-102%;汞的检出限为0.01μg/L,回收率为95%-105%,具有操作简便、快速、干扰少、灵敏度高的特点。  相似文献   

8.
水体中痕量汞检测技术经验于益雷(新疆电力环境监测中心站830000)痕量汞检测冷原子荧光法由于灵敏度高、于扰少、取样量少、操作简便等优点而显示出独特的优越性。本站使用西安无线电八厂生产的YYG系列测汞仪,灵敏度高、选择性好、分析速度快、记忆效应小、工...  相似文献   

9.
微波消解-原子荧光法同时测定TSP中砷和汞   总被引:1,自引:1,他引:0  
通过比较不同滤膜的透气效率和空白值来选择采样滤膜,探讨了不同消解方法的前处理效果,进行精密性、准确性及实际样品测试等条件实验,建立了微波消解-原子荧光法同时测定大气环境TSP中砷和汞的方法。结果表明,过氯乙烯滤膜透气性好,空白值低且稳定,微波消解能使样品消解更完全,精密度好,回收率高,尤其汞的损失少。  相似文献   

10.
冷原子荧光法测定地面水和土壤中的痕量总汞   总被引:3,自引:1,他引:3  
本文推导了汞元素冷原子荧光测试的理论公式,着重研究了载气种类;载气流速;工作电压;水蒸气;介质酸度;还原剂用量等10项因素对测定结果准确度的影响,确定了最佳实验条件,提出了地面水和土壤中痕量总汞的测试方法。同时分析了汞元素冷原子荧光法的系统误差和消除或减少系统误差的方法。  相似文献   

11.
目的研制一种高效率采集大气中汞的吸收器.方法利用一种集大泡式与玻砂板式吸收器为一体的复合式吸收器采样,并使采样还原一体化冷原子吸收法测定大气中汞.结果平均吸收率为96%,变异系数在4%~12%之间.结论复合式吸收器采样吸收效率高,适合于大气中微量汞的测定.  相似文献   

12.
The determination of trace amount nitrobenzene in wastewater on a hanging mercury drop electrode was studied. The determination conditions of pH, supporting electrolyte, accumulation potential, accumulation time, and voltammetric response were optimized. The sharp peak of the nitrobenzene was appeared at 0.05 V. The peak electric current was proportional to the concentration of nitrobenzene in the range of 1.47 × 10−5 ∼ 1.0 × 10−3 mol/l with relative standard deviations of 3.99 ∼ 8.94%. The detection limit of the nitrobenzene in water was 5 × 10−6 mol/l. The proposed method offered low limit of determination, easy operation, the use of simple instrumentation, high sensitivity and good reproducibility. It was applied to the determination of nitrobenzene in wastewater with an average recovery of 94.0% ∼ 105%. The proposed method provided fast, sensitive and sometimes real time detection of nitrobenzene.  相似文献   

13.
建立用热分解齐化原子吸收光度法测定废水中总汞的方法。将样品加热至650℃,使所有汞转化成蒸气,利用催化管将蒸气中的二价汞转化成零价汞,再利用金管捕集零价汞,加热金管释放零价汞并使其进入分析单元,在253.7 nm处以冷原子光谱法测定汞含量。方法检出限(t S)为0.045μg/L,测定下限为0.180μg/L。相对标准偏差RSD为2.3%~4.6%,加标回收率P为86.2%~94.8%。用热分解齐化原子吸收光度法直接测定废水中总汞,操作简单,污染小,毒性低,可替代《水质总汞的测定冷原子吸收分光光度法》(HJ 597-2011)。  相似文献   

14.
采用全自动石墨消解-原子荧光光度法对土壤总汞进行测定,确定最佳消解时间为1 h,消解液最佳用量为8.0 m L。方法在总汞质量浓度为0.2~2.0μg/L范围内具有良好的线性,相关系数为0.999 9,当取样量为0.500 0 g时,检出限为0.002 mg/kg;测定不同标准土壤样品总汞的结果均在保证值范围内,精密度为4.0%~7.0%,加标回收率为95.0%~108.5%;对甘肃省实际土壤及沉积物样品测定进一步验证了方法的适用性。该法适合大批量样品分析,对于提高工作效率有重要意义。  相似文献   

15.
采用高效液相色谱(HPLC)-电感耦合等离子体质谱(ICP/MS)联用测定废水中可滤态的甲基汞和无机汞,优化了仪器工作条件,讨论了方法干扰及校正办法。甲基汞和无机汞在0.500μg/L~25.0μg/L范围内线性良好,检出限分别为0.03μg/L和0.07μg/L,废水样品平行测定的RSD分别为6.5%~7.6%和6.2%~6.8%,加标回收率分别为84.0%~87.0%和88.0%~92.4%。  相似文献   

16.
综述了美国NIST元素汞发生器的基准溯源传递方法,通过在输出的汞标准气体中混合加入已知高纯度的201Hg0气体(201Hg2+标准溶液还原雾化),并采用同位素稀释电感耦合等离子体/质谱法(IDICP/MS)测量加标后201Hg/202Hg同位素丰度比例,计算出待溯源元素汞发生器输出的Hg0 质量浓度.该过程实现了从元素汞一级标准物质SRM 3133到201Hg2+标准溶液,再到元素汞发生器输出标准气体的溯源传递,完成了从NIST元素汞基准到仪器供应商生产基准的一级溯源传递,为建立符合我国需求的元素汞溯源传递方法和形成元素汞发生器溯源传递能力提供借鉴.  相似文献   

17.
针对日立 1 80 / 80原子吸收分光光度计汞分析仪附件设计的不足之处 ,在理论和实践的基础上提出了 5条具体的改进措施 ,并对改进前后仪器的使用性能作了对比。改进后仪器的灵敏度大大提高 ,所测数据的精密度及精确度均达国家标准  相似文献   

18.
We determined concentrations of selected trace elements inlivers, kidneys and blood samples from common eiders (Somateria mollissima borealis) from the eastern Canadianarctic during 1997 and 1998. Concentrations of totalmercury and organic mercury were generally low in the liversof these birds (less than 6 and 4 g g–1 dry wt,respectively). Selenium ranged between 11–47 g g–1 inlivers. Renal cadmium concentrations were among the highestever published for this species (range: 47–281 g g–1). The regressions of log-transformed concentrations ofthese trace elements in blood samples on those in liver orkidney were significant (all P-values < 0.05) andpositive. However, except for organic mercury (RM 2 = 0.83), the co-efficients of determination were low tomoderate (range of R 2: 0.26–0.52), suggesting poorto moderate predictive capability. Furthermore, therelationships between total mercury in blood and liverchanged between 1997 and 1998, suggesting that it would notbe possible to predict consistently, concentrations ofmercury in blood from those in liver based on samples takenin one year. Blood samples can be used to determineconcentrations of these trace elements in common eiders (andprobably other sea duck species as well). The use of bloodsamples is especially warranted when it is undesirable tokill the animal such as when working with rare or endangeredsea duck species or when the objective is to relate traceelement exposure to annual survival rates. However, thepredictive equations developed here should not be used topredict expected concentrations in one type of tissue fromthose in the other.  相似文献   

19.
Background Mercury Concentrations in River Water in Maine, U.S.A.   总被引:1,自引:0,他引:1  
Mercury concentrations in 58 rivers in Maine was measured to range from below detection up to 7.01 ng L-1 and averaged 1.80±1.29 ng L-1. The concentration gradient for mercury in rivers across the state was not uniform. Mercury strongly correlated with dissolved organic carbon (DOC) and aluminum, and less strongly with copper, lead, and zinc. Mercuryexhibited significant differences in correlations with chemical variables and local geology when partitioned by flow state (high or low). Mercury concentrations were greatest in rivers flowingacross either wacke-type bedrock at low metamorphic grade, or glacial-till deposits. Elevated concentrations of mercury formed a locus in northern Maine under both high and low-flow states while in southwestern Maine a locus formed only during high-flowstates. These regional differences were statistically significantwhen compared by geographical location. We suggest that there is a bedrock source of mercury in northeastern Maine that is dilutedduring periods of high runoff. The elevated concentrations detected under high-flow states, as noted in southwestern Maine, may reflect mercury released from storage in association withDOC during periods of high runoff. The association of mercury with flow state indicates that watershed processes and local geology can modulate the concentration of mercury in rivers.  相似文献   

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