共查询到17条相似文献,搜索用时 57 毫秒
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采用比光谱导数法对严重重叠的砷钼酸和磷钼酸与乙基罗丹明B的缔合物的吸收光谱进行数据解释。结果表明,此法不需分离和掩蔽而能实现对微量砷和磷的同时测定,探讨了显色条件,测定波长及求导计算时波长间距的选择等问题,应用于合成样品和水样的分析。 相似文献
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比光谱-导数-紫外分光光度法同时测定水中硝酸根和亚硝酸根 总被引:13,自引:0,他引:13
利用二元混合物的混合光谱与其中某一组分光谱的比值对波长求导,可达到分辨重叠光谱的目的。本文研究了用比光谱-导数-紫外分光光度法同时测定水样中NO3-和NO2-,以“减法技术”求导,兼具导数光度法能消除低频背景和高频噪声干扰及线性回归法分辨能力强的优点。方法避免了一般光度法需加入试剂而可能引起的误差。在pH7~9条件下测量203um~219um的光吸收值,用比光谱-导数技术处理,同时测定合成试样中0~4mg/L的NO3-和NO2-,6次测定相对标准偏差<7%,加入回收率在95%~101%之间。讨论了干扰离子的影响及消除,并与P-矩阵法作了比较。方法已用于井水、雨水及湖水中NO3-和NO2-的同时测定。 相似文献
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比光谱-导数-紫外分光光度法同时测定水中苯酚和苯胺 总被引:6,自引:0,他引:6
1 引言 苯酚、苯胺共存时,它们的紫外吸收光谱彼此重叠。同时测定混合组分中的各个组分可以应用多波长测定吸光度,然后计算各组分含量,或用多波长线性回归-导数分光光度法。比值导数波谱法能够方便地排除干扰,已用于各种多组分的测定。本文用这种方法研究了苯酚、苯胺混合物的测定,结果满意。2 实验部分 相似文献
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采用三重-比光谱导数分光光度法同时测定氨基酸注射液中的3种芳香氨基酸,讨论了测定酪氨酸、苯丙氨酸和色氨酸的实验条件.实验结果表明,在pH 7.4的NaH2PO4-NaOH缓冲溶液中,3种氨基酸的线性范围分别为:酪氨酸2.0×10-6~2.8×10-5 mol/L,苯丙氨酸2.0×10-5 ~1.6×10-3 mol/L,色氨酸4.0×10-7~1.6×10-6 mol/L.回收率在95%~105%之间. 相似文献
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《Analytical letters》2012,45(4):807-818
Abstract A new method is described to analyse a binary mixture of atrazine and chlorpyrifos, using first-derivative spectrophotometry for atrazine and first derivative of the ratio spectra for chlorpyrifos. The procedure does not require any separation step. Calibration graphs were linear up to 15 μg.mL?1 of atrazine and to 10 μg.mL?1 of chlorpyrifos. The method has been applied to determine both compounds in pesticide formulations, in soils and waters. 相似文献
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研究了用比值光谱-导数分光光度法同时测定两组分混合染料体系中分散大红BWFL和分散红玉ZGFL的方法。回收率在95.6%~107.5%。方法已用于分析纺织纤维上分散大红和分散红玉二元混染体系。 相似文献
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《Analytical letters》2012,45(6):1179-1191
Abstract Two new spectrophotometric methods are used for the determination of acrivastine and pseudoephedrine hydochloride in their mixture without previous chemical separation. In the first, second derivative spectrophotometry, the measurements are made at 288.0 nm for acrivastine and at 270.2 nm for pseudoephedrine hydrochloride in the second derivative spectra of their solution in 0.1M NaOH. In the second, ratio spectra derivative spectrophotometry, the amplitudes are measured at 276.0 nm and 298.5 nm corresponding to two maximums for acrivastine, and at 252.6 nm and 268.3 nm corresponding to a maximum and a minumum, respectively, for pseudoephedrine hydrochloride in first derivative of their ratio spectra plotted by using of their solutions as divisor. The methods were successfully applied for the determination of these drugs in a commercial pharmaceutical formulation capsule. 相似文献
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比导数荧光光谱法测定混合芳烃 总被引:3,自引:0,他引:3
比值导数荧光光谱法是将混合物的光谱除以其中一组分的光谱得到比值光谱,利用比值光谱对波长求导所得到的比值导数光谱来达到消除干扰组分影响、分辨重叠光谱的目的。作者研究用比值导数荧光光谱法对2组分和3组分荧光光谱严重重叠的菲、、蒽混合芳烃溶液进行分析,测试效果良好,回收率为94%~105%。 相似文献
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《Analytical letters》2012,45(8):1511-1524
Abstract Two methods have been developed for the simultaneous determination of Amitryptiline and Perphenazine: the zero-crossing (I) and the derivative ratio spectrum (II) methods and both use the derivative spectrophotometry. The methods have been applicable in the ranges of 1 to 30 μg·ml?1 of Amitryptiline (I and II) and between 1 and 8 μg·ml?1 and from 1 to 7 μg·ml?1 of Perphenazine for the methods I and II respectively. The accuracy of the proposed methods have been studied and they have been used in the determination of Amitryptiline and Perphenazine in commercially available pharmaceuticals. 相似文献
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双波长分光光度法同时测定浆料中的聚乙烯醇和淀粉 总被引:1,自引:0,他引:1
本文报道了用双波长分光光度法同时测定变性聚乙烯醇和淀粉醋酸酯的一种新方法。分别选择670.0~540.0nm以及590.0~730.0nm波长对测定变性聚乙烯醇和淀粉醋酸酯。变性聚乙烯醇)~32μg/ml,淀粉醋酸酯0~130μg/ml浓度范围内,吸光度差值△A遵循比耳定律。当淀粉醋酸酯与变性聚乙烯醇的浓度比在1.3~16范围内,变性聚乙烯醇和淀粉醋酸酯的样品回收率分别为99.5~105%和97~108%。所拟定的方法可测定浆料中变性聚乙烯醇和淀粉醋酸酯。本法与盐酸水解淀粉法测定的聚乙烯醇含量相吻合。本法简便快速。 相似文献