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201.
火焰原子吸收分光光度法测定废水中总铬 总被引:5,自引:0,他引:5
研究环境样品中总铬用火焰原子吸收分光光度法测定。选择不同实验条件 ,确定了最佳的分析条件 ,并通过标准样品和实验样品的分析 ,验证了方法的准确度和精密度。实验证明 ,此方法快速方便、准确度高、精密度好。 相似文献
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根据(JJF 1059.1-2012),建立了原子荧光度法测定保健食品中硒不确定度数学模型,分析了整个过程中各种不确定度的影响因素。量化各不确定度分量,计算合成不确定度和扩展不确定度。为检测机构实验室质量管理体系正常运行提供参考资料。本次测量结果为0.822±0.04 mg/kg,合成相对不确定度值为0.022 7;扩展不确定度为0.04 mg/kg,最大的不确定度是样品重复测定引起,其次是标准曲线拟合引起的不确定度。 相似文献
204.
通过对石墨炉原子吸收法、电感耦合等离子体质谱法、比色法测定水中钴的方法性能进行比对研究,分析了各自的优缺点,为实验人员对钴分析方法选择提供良好的技术依据。当测定钴含量为5.00%~99.5μg/L时,石墨炉原子吸收法的RSD为2.6%~3.9%,加标回收率为93.5%~101.4%;ICP-MS法的RSD为2.0%~3.3%,加标回收率为95.6%~97.1%;5-CI-PADAB光度法的RSD为3.8%~4.8%,加标回收率为91.6%~103.8%。 相似文献
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苯胺在不同酸度溶液中具有不同的结构和紫外吸收光谱.以苯胺的酸溶液为参比液,以等浓度的苯胺水溶液为测定液,在280nm处测定苯胺含量.结果表明,当苯胺浓度为1~100mg/L时,吸光度与浓度之间存在良好的线性关系,据此建立了紫外差示分光光度法.该法不需分离可直接测定工业废水中苯胺含量,简便快速,回收率高于96.7%. 相似文献
207.
关于红外光度法测定水中油类的讨论 总被引:1,自引:0,他引:1
结合实际工作经验,对红外光度法测定石油类和动植物油(GB/T16488-1996)所规定的仪器、试剂等进行了进一步的探讨,并提出操作建议。 相似文献
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Elisandra C. Martins Vander De F. Melo 《Journal of environmental science and health. Part. B》2016,51(9):609-615
A method for determining atrazine in soil extracts was evaluated by flow injection analysis with spectrophotometric detection. The method is based on the reaction of atrazine with pyridine in an acid medium followed by the reaction with NaOH and sulfanilic acid. Several analytical conditions were previously studied and optimized. Under the best conditions of analysis, the limits of detection and quantification were 0.15 and 0.45 mg L?1, respectively, for a linear response between 0.50 and 2.50 mg L?1, and a sampling throughput of 21 determinations per hour. Using the standard addition method, the maximum relative standard deviation of 17% and recovery values between 80 and 100% were observed for three extracts from soil samples with different composition. The proposed method is simple, low-cost and easy to use, and can be employed for studies involving atrazine in soil samples or for screening of atrazine in soils. 相似文献
210.
A simple, fast, and low-cost analytical procedure was developed for trace-level determination of inorganic vanadium species by dispersive liquid–liquid microextraction in combination with spectrophotometry. Vanadium in pentavalent form, V(V), was quantitatively extracted into organic phase as 4-(2-pyridylazo)-recorcinol (PAR) complex in the presence of N-cetyl-N,N,N-trimethyl ammonium bromide (CTAB) as counter-ion. Vanadium (IV) was masked with 1,2-diaminocyclohexanetetraacetic acid to allow speciation analysis. Total vanadium was determined after oxidation of V(IV) to V(V). The main factors affecting preconcentration and spectrophotometric detection of vanadium species such as pH, concentration of PAR and CTAB, the type and volume of the extraction, and disperser solvents were optimized. The limit of detection and enhancement factor obtained under optimum conditions were found to be 0.06 μg L?1 and 98, respectively. Relative standard deviations for V(IV) and V(V) at 3.0 μg L?1 were less than 2.4%. The presented procedure was applied to environmental water samples for selective determination of vanadium species. Moreover, the method was applied to determination of vanadium in edible salt samples, due to its applicability in high-NaCl-containing solutions. The validity of proposed method was proven by spike recovery experiments and also independent analysis by inductively coupled plasma mass spectrometry. 相似文献