共查询到19条相似文献,搜索用时 187 毫秒
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研究了微波消解-浊点萃取-火焰原子吸收光谱法(FAAS)测定空心胶囊中痕量铬的方法。空心胶囊通过微波消解,以二乙基二硫代氨基甲酸钠(DDTC)为络合剂络合消解液中铬(Ⅵ),非离子表面活性剂Triton X-114为萃取剂,结合FAAS测定空心胶囊中痕量铬,与《中国药典》(2010版)检测方法具有较好一致性。考察了溶液的pH值、络合剂和表面活性剂浓度、平衡温度和时间等条件对浊点萃取效果的影响。在最优条件下,铬(Ⅵ)线性范围为0~10μg/mL,检出限(3σ)为7.6ng/mL,相对标准偏差为1.5%(n=10),回收率在95%~102%之间。方法灵敏度高,重复性好,适合于胶囊中铬的日常检测。 相似文献
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人血白蛋白制品中超痕量铝的测定 总被引:1,自引:0,他引:1
建立了浊点萃取石墨炉原子吸收光谱法测定人血白蛋白样品中超痕量铝的新方法。探讨了溶液酸度、络合剂的种类及浓度、非离子表面活性剂的浓度、平衡时间及温度等因素对浊点萃取过程的影响。以1-(2-吡啶偶氮)-2-萘酚为络合剂,Triton X-114为非离子表面活性剂,浊点萃取分离富集10mL样品溶液,Al(Ⅲ)的富集倍数为34.8,在最佳工作条件下,铝的检出限为0.06μg/L;样品测定的相对标准偏差(n=7)为3.6%,加标回收率95.6%~98.4%。方法适合人血白蛋白样品中超痕量铝的分析测定。 相似文献
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浊点萃取-石墨炉原子吸收光谱法测定环境样品中的痕量镉 总被引:21,自引:0,他引:21
研究了浊点萃取-石墨炉原子吸收光谱法(GFAAS)测定痕量镉的新方法,利用表面活性剂Triton X-100和络合剂1-(2-吡啶偶氮)-2-萘酚(PAN)对镉进行浊点萃取。详细探讨了影响浊点萃取及测定灵敏度的因素。优化条件为:0.25 mL 30%NaC l,pH 8.5,0.50 mL、4.0×10-4mol/L PAN,0.2 mL 1.0%TritonX-100。在最佳条件下,镉的富集倍率为50倍,检出限为5.9 ng/L,RSD为2.1%。该方法用于环境样中痕量镉的富集和测定,结果令人满意。 相似文献
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建立了浊点萃取-石墨炉原子吸收光谱法(GFAAS)测定痕量金属钯的新方法,利用表面活性剂Triton X-114和络合剂2-(5-溴-2-吡啶偶氮)-5-二甲氨基苯胺(5-Br-PADMA)对钯进行浊点萃取。研究了溶液pH、试剂浓度、平衡温度和加热时间等因素对浊点萃取及测定灵敏度的影响。优化条件为:pH 5.50 HAc-NaAc缓冲,0.08 mL 5×10-4 mol/L 5-Br-PADMA,0.70 mL10g/L Triton X-114。在最佳条件下,方法的线性范围为0.1~10 ng/mL,钯的检出限为0.068 ng/mL,富集倍率为45倍。该方法可用于环境样品中痕量钯的富集和测定,结果令人满意。 相似文献
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为了适应水中痕量汞的分析要求,降低汞的检出限,建立了一种超声辅助浊点萃取预富集联合原子荧光光谱法测定水样中痕量汞的方法。该方法采用硫代米氏酮为络合剂,以非离子型表面活性剂Triton X-114为萃取剂,将水样中的痕量汞富集于表面活性剂相。在原子荧光光谱分析前,加入磷酸三丁酯作为消泡剂,用5%盐酸溶液定容,富集倍数可以达到10倍。优化萃取体系pH、络合剂用量、萃取剂用量、超声平衡条件等浊点萃取的条件,在最优条件下,该方法检出限为0.003 μg/L,相对标准偏差为4.2%~8.6%,加标回收率为85%~106%。结果表明,超声辅助浊点萃取-原子荧光法能够适用于对地表水、自来水等清洁水样中痕量汞的分析,且具有更低的检出限,良好的准确度和精密度,能够适应于更高的样品分析要求。 相似文献
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The possibility was investigated by using 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (PMBP) as the chelating reagent for separation and preconcentration of manganese(II) by cloud point extraction (CPE) and subsequent determination by flame atomic absorption spectrometry (FAAS). The effects of experimental conditions such as pH, concentration of chelating agent and surfactant, equilibration temperature and time on cloud point extraction were studied. Under the optimum conditions, preconcentration of 10 ml of sample solution permitted the detection of 1.45 ng mL(-1) of manganese with an enrichment factor of 20. The proposed method was applied to the determination of trace manganese in water samples with satisfactory results. 相似文献
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Cloud point extraction and preconcentration of gold in geological matrices prior to flame atomic absorption determination 总被引:2,自引:0,他引:2
Wifky S. El-Naggar Taysseer A. Lasheen El-Said A. Nouh Ahmed K. Ghonaim 《Central European Journal of Chemistry》2010,8(1):34-40
Brilliant green was used as a complexing agent in cloud point extraction (CPE) and applied for selective preconcentration
of trace amounts of gold in geological matrices. The analyte in the initial aqueous solution was acidified with hydrochloric
acid (0.1 M) and octylphenoxypolyethoxyethanol (Triton X-114) was added as a surfactant. After phase separation, based on
the cloud point separation of the mixture, the surfactant rich phase was diluted with methanol and the analyte determined
in the surfactant rich phase by flame atomic absorption spectrometry (FAAS). After optimization of the complexation and extraction
conditions, a preconcentration factor of 31 was obtained for only 10 mL of sample. The analytical curve was linear in the
range of 3–1000 ng mL−1 and the limit of detection was 1.5 ng mL−1. The proposed method was applied to the determination of gold in geological samples. 相似文献
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Jamshid L. Manzoori Hossein Abdolmohammad-Zadeh Mohammad Amjadi 《Mikrochimica acta》2007,159(1-2):71-78
A simple and sensitive cloud point extraction method has been developed for the preconcentration of ultra-trace amounts of
gold as a prior step to its determination by electrothermal atomic absorption spectrometry. It is based on the extraction
of gold in hydrochloric acid medium using the non-ionic surfactant polyethyleneglycolmono-p-nonylphenylether (PONPE 7.5) without adding a chelating agent. The preconcentration of a 50 mL sample solution was thus enhanced
by a factor of 200. The resulting calibration graph was linear in the range of 10–200 ng L−1 with a correlation coefficient of 0.9993. The limit of detection (3s) obtained under optimal conditions was 2.0 ng L−1. The relative standard deviation for 10 replicate determinations at a 100 ng L−1 Au level was 3.6%. The method was applied to the ultra-trace determination of gold in water and copper samples. 相似文献
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Sayed Zia Mohammadi Daryoush Afzali Davood Pourtalebi 《Journal of Analytical Chemistry》2011,66(7):620-625
In this article, a sensitive cloud point extraction procedure for the preconcentration of trace amounts of palladium, gold
and nickel prior to their determination by flame atomic absorption spectrometry has been developed. The cloud point extraction
method is based on the complexation of Pd(II), Au(II), and Ni(II) ions with 1-(2-pyridylazo)-2-naphthol and entrapping in
non-ionic surfactant Triton X-114. The main factors affecting cloud point extraction efficiency, such as pH of sample solution,
concentration of 1-(2-pyridylazo)-2-naphthol and Triton X-114, equilibration temperature and time, were investigated in detail.
Under the optimized conditions, calibration curves were constructed for the determination of palladium, gold and nickel according
to the general procedure. Linearity was maintained from 0.01 to 1.0 μg/mL for palladium, 10.0 μg/mL to 1.5 μg/mL for gold,
and 10.0 μg/mL to 0.5 μg/mL for nickel. Detection limits based on three times the standard deviation of the blank divided
by the slope of analytical curve (3Sb/m) for Pd(II), Au(III), and Ni(11) ions were 3.4, 3.9, and 2.4 μg/mL, respectively.
Seven replicate determination of a mixture of 0.5 μg/mL palladium and gold and 0.2 μg/mL nickel gave a mean absorbance of
0.174, 0.150, and 0.201 with relative standard deviation ±1.5, ±1.3, and ±1.8%, respectively. The high efficiency of cloud
point extraction to carry out the determination of analytes in complex matrices was demonstrated. The proposed method has
been applied for determination of trace amount of palladium, gold and nickel in certified reference material and water samples
with satisfactory results. 相似文献
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《Analytical letters》2012,45(9):1853-1864
Abstract A new method based on the cloud point extraction (CPE) separation and ultraviolet spectrometry determination was proposed for the determination of albumin. When the system temperature is higher than the cloud point extraction temperature (CPT) of the mixed surfactant of p‐octyl polyethyleneglycolphenyether (Triton X‐100) and sodium dodecyl sulfate (SDS), serum albumin could be extracted into surfactant‐rich phase. The main factors affecting the cloud point extraction were investigated systematically. Under the optimized conditions, the determination limit for serum albumin as low as 0.18 µg/mL was obtained by preconcentrating a 10 mL sample solution, and the relative standard deviation (n=10, c=40.0 µg/mL) was 3.77%. The proposed method was applied to the determination of albumin in serum samples. The results obtained by this method were in good agreement with coomassie brilliant blue (CBB). 相似文献
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A new method for the determination of trace cadmium in water samples by flame atomic absorption spectrometry (FAAS) after
cloud point extraction (CPE) is proposed. The method is based on the complexation of Cd with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone
(PMBP) in the presence of non-ionic micelles of Triton X-100. The effect of experimental conditions such as pH, concentration
of chelating agent and surfactant, equilibration temperature and time on cloud point extraction was studied. Under the optimum
conditions, the detection limits are 0.64 ng mL±1 with relative standard deviations (RSDs) of 2.1% (n = 10). The proposed method was applied to the determination of trace
cadmium in water samples with satisfactory results. 相似文献
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Summary Methods for the simultaneous preconcentration of lanthanides by cloud point extraction and their determination using neutron
activation analysis have been developed. The preconcentration method involves the use of a nonionic surfactant and a chelating
agent. A fairly small volume of surfactant-rich phase was obtained under optimized experimental conditions, leading to detection
limits between 0.3 and 3.0 ng . g-1. Critical parameters that influence extraction efficiency were solution pH and concentration of chelating agent, and to a
lesser extent, ionic strength and temperature. Most of the chelates were quantitatively extracted (>90%) at high pH values.
Selective separation can be achieved by varying some of the experimental conditions. 相似文献
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A rapid, selective, and sensitive cloud point extraction process using mixed micelle of a nonionic surfactant Triton X-114
and an anionic surfactant, SDS, to extract chlorine from aqueous solution was investigated. The method is based on the color
reaction of chlorine with N,N-diethyl-p-phenylenediamine (DPD) in phosphate buffer media and cloud point extraction of the produced dye. Various factors and extraction
and reaction conditions such as surfactant concentration and reagent concentration were studied and the analytical characteristics
of the method (e.g. limit of detection, linear range, preconcentration, and improvement factors) were obtained. Linearity
was obeyed in the range of 3.0–450 ng/mL of chlorine and the detection limit of the method was 1.0 ng/mL. The interference
effects of some cations and anions were also tested. The proposed method was successfully applied to the determination of
free chlorine in drinking, river, well and pool swimming water samples. 相似文献