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火焰原子吸收光谱法间接测定植物叶片中的硫 总被引:1,自引:0,他引:1
将植物叶片中的有机硫和无机硫用酸消化使植物体中的各种硫转化成硫酸盐,利用硫酸盐与铬酸钡悬浊液反应释放出铬酸根,以火焰原子吸收光谱法测定溶液中游离的铬酸根,间接测定消化液中的硫酸盐。研究了试验条件对测定灵敏度的影响,确定了最佳试验条件,该法用于植物叶片中硫含量的分析,回收率在92.5%~96.3%之间。 相似文献
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火焰原子吸收光谱法间接测定碘 总被引:14,自引:0,他引:14
1引言碘是人体生命活动中极为重要的微量元素。灵敏准确有效地测定各种物质中碘的方法具有重要意义。微量碘的测定,近年来报道较多的有催化光度法、溶出伏安法、示波极谱法、碘离子选择性电极法以及气相色谱法等,应用原子吸收光谱法的甚少。本文研究了在加入适量乙醇的情况下,将I-与过量的Ag+反应,经过离心沉淀后,直接用标准曲线法测定剩余的Ag+,然后计算出碘含量。用该方法对海带、含碘药片、加碘食盐3种不同试样中的碘进行测定,采用加入适量红水或硝酸的方法排除在样品中可能存在的能与银生成沉淀的其他阴离子的干扰,得… 相似文献
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火焰原子吸收光谱法间接测定水中硫酸盐 总被引:8,自引:0,他引:8
研究利用硫酸根与铬酸钡悬浊液反应释放出铬酸根,以火焰原子吸收光谱法测定溶液中游离的铬酸根,间接测定硫酸根。并研究了试验条件对测定灵敏度的影响,确定了最佳试验条件,该法用于水中可溶性硫酸盐的分析,回收率在88.5~104.8%之间。 相似文献
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Hg(Ⅱ)在适当条件下可定量置换螯合物DDTC-Cu中的Cu(Ⅱ).通过火焰原子吸收测定被置换入水相中的Cu(Ⅱ)而间接得出Hg(Ⅱ)的含量. 相似文献
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火焰原子吸收光谱法间接测定非金属材料中氯 总被引:9,自引:0,他引:9
报道了火焰原子吸收光谱法(FAAS)间接测定非金属材料中氯的方法,采用AgCl沉淀,测定剩余Ag~+间接求出氯含量。方法的特征浓度为0.014mg/L(1%吸收),检出限为0.032mg/L(3),测定下限为0.11mg/L,相对标准偏差(RSD)为1.5%~10%,样品加标准回收率在91.4%-105%之间。 相似文献
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利用高频燃烧红外碳硫分析仪建立快速测定萤石中的总硫含量的方法。方法讨论并优化了样品预处理的温度与时间、最佳称样量、助熔剂的选择及加入量等参数,选择740℃灼烧5min的方法去除样品中水分,称样量0.2g,纯铁0.5g+样品0.2g+锡粒0.2g+钨粒1.6g为熔样条件。通过对萤石有证标准物质的测定以及与X射线荧光光谱标准方法测定结果的比对,对方法的准确度进行验证,方法的标准偏差在0.98~5.25%之间,结果表明该方法准确度好、精密度高,能够快速测定萤石中的硫含量。 相似文献
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《Analytical letters》2012,45(12):2355-2366
Abstract An indirect atomic absorption spectro-metric (AAS) method using electrothermal atomization (ETAAS) for the determination of cationic surfactants has been proposed. The method involves ion-pair formation between cationic surfactant and sodium hexanitro-cobaltate(III), extraction of the ion-pair into 1, 2-dichloroethane and determination of cobalt con centration in organic phase by ETAAS and hence indirectly relating to the cationic surfactant concentrations. Surfactants of the anionic and nonionic group do not interfere to a great extent, and matrix inter ferences from many other cations, anions and organics are also not observed. The method has been success fully applied to cationic surfactant determination in waste water and hair rinsers. Relative standard deviation values (RSD) of 3.2% for waste water samples and 4.3% for shampoo were observed in these analyses. 相似文献
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《Analytical letters》2012,45(8):1517-1531
Abstract The reaction of lincomycin with cupric ions in alkaline medium was taken as a basis for the colorimetric and indirect atomic absorption spectrometric (AAS) determination of lincomycin hydrochloride. The AAS procedure was based on the extraction of copper-lincomycin complex at pH 11, into n-butanol. The copper content in this extract was determined by AAS. The response was linear for up to 30 μg ml?1 of lincomycin. The method is accurate, sensitive and simple. The proposed methods were applied to pharmaceutical preparations with fine accuracy. 相似文献
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微波消解-原子吸收法测定氧化铝为载体的钯催化剂中钯 总被引:2,自引:0,他引:2
报道了微波消解-AAS法测定氧化铝为载体的钯催化剂中钯的新方法,试验了微波消解溶样条件(溶解试剂、压力、时间和功率等),研究了测定介质的影响,通过在样品测定液中加入铝基体至铝浓度为4 mg/mL,消除了铝对钯测定的干扰.该法测定结果与光度法的结果一致,相对标准偏差小于1.5%(n=5). 相似文献
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Evaluation of the solid-phase partitioning of sulfur is frequently an important analytical component of risk assessments at hazardous waste sites because minerals containing reduced-sulfur can significantly affect the transport and fate of organic and inorganic contaminants in natural environments. We applied selected methods for the determination of total sulfur, acid-volatile sulfide (AVS), chromium-reducible sulfur (CRS), and extractable-sulfate in standard reference materials and sediment samples from a contaminated site. A coulometric titration method is presented and evaluated for total sulfur, AVS, and CRS. This method is especially advantageous for AVS and CRS determinations because hydrogen sulfide gas evolved during chemical extraction is detected and quantitated in-line; consequently, measurement endpoints can be precisely determined without need for setting arbitrary time limits. The coulometric method allows for improved data quality and increased laboratory throughput of samples. Data on sulfur partitioning are presented for four standard reference materials (NIST 1646a, NIST 2780, CCRMP LKSD-1, CCRMP RTS-3) for the purpose of supporting quality control in environmental studies involving the geochemical and biochemical cycling of sulfur. 相似文献
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Yi Pan Zhi-Ang Li Xin Zhou Wei-Kang Wang Xing Wang Zheng Fang Cheng-Bin Zheng 《中国化学快报》2017,28(8):1670-1674
A new detection system consisted of a flame ionization detector (FID) and a sulfur chemiluminescence detector (SCD) was developed for sensitive and interference free determination of total sulfur in natural gas by non-separation gas chromatography. In this system, sulfur containing compounds and hydrocarbons were firstly burned in the FID using oxygen rich flame and converted to SO2, CO2 and H2O, respectively. The products from FID were transported into the SCD with hydrogen rich atmosphere wherein only SO2 could be reduced to SO and reacted with O3 to produce characteristic chemiluminescence. Therefore, the chemiluminescence of CO found in conventional SCD were eliminated because CO2 could not be reduced to CO under these conditions. The experimental parameters were systematically investigated. Limit of detection obtained by the proposed system is better than 0.5 μmol/mol for total sulfur and superior to those previously reported. The proposed method not only retains the advantages of the conventional SCD but also provides several unique advantages including no hydrocarbon interference, better stability, and easier calculation. The utility of this technique was demonstrated by the determination of total sulfur in real samples and two certified reference materials (GBW 06332 and GBW (E) 061320). 相似文献
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原子吸收光谱法间接测煤中形态硫 总被引:5,自引:1,他引:4
利用 SO2 -4 在 Ba Cr O4溶液中 ,可定量置换出 Cr O2 -4 ,进行原子吸收光谱法测铬 ,间接测定煤中形态硫的研究。方法较现行使用的重量法简便、快速 ,干扰少 ,硫含量在 1× 1 0 - 4 ~ 3× 1 0 - 3mg·ml- 1 呈良好线性关系。用于样品分析 ,结果满意。 相似文献