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高灵敏反应流动注射化学发光法测定抗坏血酸 总被引:5,自引:0,他引:5
基于抗坏血酸对Fe^2+-Luminol-O2体系化学光的抑制效应,利用反应相流注射技术,建立了一个测定抗坏血酸的高灵敏化学发光新方法。该法检出限达2*10^-10g/mL;抗坏血酸浓度在1*10^-9-1*10^-6g/mL范围内与体系化学发光强度减小量呈良好线性相关;相对标准偏差为1.9%。 相似文献
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流动注射—吐温40化学发光新体系测定贵金属冶金物料中微量铱 总被引:5,自引:0,他引:5
本文研究了吐温40-KOH-H2O2-Ir化学发光新体系,采用流动注射进样技术,建立了测定铱的新的化学发光分析法,检测限为1.1×10^-13g/L;线性范围为每mL1.0×10^-9-1.0×10^-5g。经离子交换分离Au和Os离子后,测定贵金属冶金物料中微量铱,结果满意。 相似文献
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偶合反应化学发光法测定痕量银的研究 总被引:6,自引:0,他引:6
本将Ag(Ⅰ)催化S2O^2-8氧化Mn(Ⅱ)生成MnO^-4的催化反应与LuminolMnO^-4-OH^-的化学发光反应相偶合,建立起一种新的灵敏测定痕量银的化学发光分析法,在所研究的优化条件下,该法测定银的选择性较好,检测限达到3.2×10^-12g/mLAg线性浓度范围为1.0×10^-11-1.0×10^-5g/mLAg,用于水样分析,结果较为满意。 相似文献
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研究了新吖啶衍生物9,10-二甲基吖啶氟磺酸盐的化学发光特性。建立了测定Co62+的化学发光新体系。方法线性范围为1.0×10^-10-1.0×10^-7g/mL;检测限为5.0×10^-11g/mLCo^2+。测定5.0×10^-9g/mLCo62+的相对标准偏差为6.0%。方法选择性好,用于自来水,江水,池塘水中痕量钴的测定,结果令人满意。 相似文献
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流动注射化学发光法测定甲氨蝶呤 总被引:8,自引:0,他引:8
研究了甲醛增强高锰酸钾与甲氨蝶呤的化学发光反应,由此建立了一种测定甲氨蝶呤的流动性注射化学发光分析法,方法的检出限为3.4×10^-9g/mL,相对标准偏差为1.1%(2.0×10^-6g/mL甲氨蝶呤,n=11)线性范围为1.0×10^-8~1.0×10^-5g/mL。该法已用于甲氨蝶呤针剂及片剂中甲氨蝶呤含量的测定。 相似文献
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液相化学发光法测定微量硒 总被引:7,自引:0,他引:7
以碘-鲁米诺化学发光反应作指示反应,利用硒(Ⅳ)对Cr(Ⅵ)-KI反应的催化作用,提出了测定微量硒的新方法。方法的检出限为2.3*10^-11g/mL,线性范围为1.0*10^-10-1.0*10^-7g/mL。该方法简单,快速,准确度较高,用于茶叶和人发中硒的测定,结果满意。 相似文献
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KBrO3—KBr紫外分光光度法测定痕量水杨酸 总被引:5,自引:0,他引:5
研究了HCl溶液中KBrO3-KBr紫外分光光度法测定水杨酸的条件,建立了测定痕量水杨酸的新方法。结果表明,在0.6mol/LHCl,3*10^-5mol/LKBrO3,5*10^-4mol/LKBr,6*10^-4mol/lKI溶中测定水杨酸,其线性范围为0.2-4.0mg/L,表观摩尔吸光系数为1.9*10^-4L.mol^-1.cm^-1,Sandell为7.3μg/cm^2。sg if e 相似文献
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The reactions of uranium pentaethoxide with salicylic acid have been carried out in different stoichiometric ratios, yielding products of the type, U(OEt)3(C7H4O3), U(OEt)(C7H4O3)2, U(C7H4O2)2(C7H4O3), and U2(C7H4O3)3. A detailed study of the complexation reactions of uranyl ion with salicylic acid have also been made by potentiomertic and conductometric methods. The formation of 1:1 and 1:2 complexes have been confirmed by preparative studies. Two compounds, viz. (C5H6N)2UO2(C7H4O3)2 (NH4)2UO2(C7H4O3)2 have been isolated. 相似文献
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Stoichiometric determination of complexes of La (III) with some derivatives of salicylic acid by monovariation and Job's method of continuous variation have shown formation of 1:3 complex in each case. The dissociation constants of these complexes have been determined by conductometric and spectrophotometric methods. 相似文献
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J. E. Schmidtund J. C. Krantz Jr und D. Henville 《Fresenius' Journal of Analytical Chemistry》1936,106(1-2):79
Ohne Zusammenfassung 相似文献
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《Analytical letters》2012,45(3):573-583
Abstract A procedure based on a spot test for salicylate is presented. The method is simple, rugged and is based on the salycilate native fluorescence measurement on the surface of a filter paper by using optical fibers for light conduction. The fluorescence was linear at concentration range of 0.01–0.4 mmol l?1. The relative standard deviation of 5% (n=10) was observed. Detection and quantification limits were 4 and 14 µmol l?1, respectively. The results obtained in pharmaceutical salicylate determinations showed that practically no statistical difference existed with the pharmacopeical method (95% confidence level). The recovery studies in biological samples spiked with salicylic acid at overdose concentration levels showed that the matrix sample did not interfere in the method. 相似文献
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《Analytical letters》2012,45(3):425-442
ABSTRACT A microbiosensor is proposed for a quick and easy amperometric determination of salicylate. The methodology involves the use of the enzyme salicylate hydroxylase (SH) to convert salicylate to catechol, which is then oxidised at the carbon fibre electrode. The covalent immobilisation of the enzyme onto a carbon fibre electrode via carbodiimide results in an amperometric biosensor with high sensitivity, low detection limit and good stability. The response of the biosensor is linearly proportional to the salicylate concentration between 1.0 10?7 and 2.0 10?6 mol L?1, at an applied potential of 300 mV vs SCE, with a response time of 3.5 s and a detection limit of 3.3 10?8 mol L?1. The relative standard deviation for the determination was 4.1% for n=10. The biosensor was applied to determine salicylate in urine and pharmaceutical samples and compared to the reference method with a good correlation. 相似文献