磷、砷、硅钼杂多酸-罗丹明6G荧光猝灭法连续测定磷、砷、硅的研究

本文报道了在非离子表面活性剂PVA存在下,磷、硅、砷钼杂多酸-罗丹明6G形成离子缔合物,使罗丹明6G荧光猝灭。研究了罗丹明6G-磷、砷、硅钼杂多酸体系荧光光谱,形成条件和配合物组成。试验了共存离子的干扰。应用此方法对铜合金中磷、砷、硅进行同时测定,结果满意。     

卡尔曼滤波分光光度法同时测定钢样中的硅、磷、砷

研究了在聚乙烯醇存在下,硅、磷、砷钼杂多酸与罗丹明6G形成离子缔合物的反应,建立了能同时测定硅、磷、砷的卡尔曼滤波分光光度法。用于钢样中微量硅、磷、砷的同时测定,操作简便快速,相对误差小于8％。     

卡尔曼滤波分光光度法同时测定钢榈的硅,磷,砷

研究了在聚乙烯醇存在下，硅、磷、砷杂多酸与罗丹明６Ｇ形成离子缔合物的反应，建立了能同时测定硅、磷、砷的卡尔曼滤波分光光度法。用于钢样中微量硅、磷、砷的同时测定，操作简便快速，相对误差小于８％。     

磷、砷、硅共存时用结晶紫测定磷

本文研究了聚乙烯醇(PVA-124)存在下,磷、砷、硅共存时以结晶紫-磷钼酸直接在水相测定磷的掩蔽体系,并探讨了各个元素分别测定的可能性。 1.主要试剂和仪器:磷、砷和硅的标准溶液按常法配制。所用仪器主要为72型分光光度计。 2.聚乙烯醇存在下用结晶紫测定磷的条件:量取磷标准溶液适量于25ml比色管中,加入H_2SO_4(5N)4.0ml,钼酸铵溶液(0.05M)2.0ml,聚乙烯醇溶液(2.5％)2.5ml,结晶     

分光光度法测含铌磷酸盐激光玻璃中硅的含量

测低含量的二氧化硅,分光光度法比较适用,但在类似条件下,磷、砷也和钼酸铵形成杂多酸,干扰测定,虽然可利用两种杂多酸形成速度不同,而同时测定硅和磷,或利用两种杂多酸稳定常数不同加入络合剂使磷分解,硅钼酸仍能稳定存在而进行硅的测定,但磷含量不能大于硅含量的150倍,否则会形成磷钼酸沉淀,使测定无法进行。本文提出加入适量的乙醇,可阻止磷钼酸沉淀.当铌、磷共存时加入常量的双倍掩蔽剂能消除铌、磷共存时产生的干扰.     

流动注射荧光法测定磷,砷,硅

研究了流动注射荧光法同时测定磷，砷，硅。确定了最佳反应条件。最大发射光波长５５５ｎｍ。磷，硅在０－８０μｇ／Ｌ，砷在０－１００μｇ／Ｌ范围内有良好的线性关系。     

钢铁中磷砷硅锰联合快速测定的改进

对钢铁中砷含量的快速测定方法提出了改进意见,提高了稳定性和准确度,拟定了硅、锰、磷、砷四元素的联合快速测定新规程.     

罗丹明B-砷锑钼兰离子缔合物分光光度法测定微量砷

测定微量砷有多种方法。本文介绍通过砷、锑、钼和罗丹明B在乳化剂OP的水溶液中形成离子缔合物的显色条件试验,提出了磷、硅、砷共存时高灵敏测定砷的分光光度法。该法通过控制酸度以消除硅干扰,并可不经分离和富集,在温度9℃以上直接于水相中测定水和土壤中的痕量砷。     

三波长K系数分光光度法同时测定痕量磷,砷,硅

１引言以碱性染料光度法同时测定磷、砷、硅已有报道，但需加入掩蔽剂或经还原－萃取等分离。本文用三波长Ｋ系数法原理，由计算机选出最佳波长组合，不经分离、掩蔽，于一份试液中同时测定痕量磷、砷、硅，其线性范围分别为４０．０～２４０．０μｇ／Ｌ、３２．０～１２０．０μｇ／Ｌ、３２．０～３２０．０μｄ／Ｌ。用于合成样品测定，结果令人满意。２实验部分２．１仪器与试剂７２２型光栅分光光度计。硅标准溶液：用高纯ＳｉＯ２（９９．９９％）以常法熔融配成ｐＨ约１．５的溶液，含硅０．１００ｇ／Ｌ；磷标准溶液：用ＫＨ２ＰＯ…     

杂多酸多元配合物显色计算机分光光度法同时测定硅磷砷

本文研究了在聚乙烯醇存在下，硅，磷，钾钼杂多酸与罗丹明６Ｇ形成离子缔合物的最佳条件，建立了计算机求解超定方程组分光光度法同时测定硅，磷，砷的方法，用设计出的计算机程序对实际样品进行分析的结果表明，操作简便快速，结果可靠。     

Simultaneous Kinetic Determination of Phosphate and Silicate by Spectrophotometric H‐Point Standard Addition Method

The H‐point standard addition method (HPSAM), based on spectrophotometric measurements for simultaneous determination of phosphate and silicate, has been established. The method is based on the difference between their reactions rates with molybdenum in the presence of ascorbic acid. The results revealed that phosphate and silicate could be determined simultaneously with the concentration ratios of phosphate to silicate varying from 1:10 to 12:1 in the binary mixtures. The effects of chelating agent nature, time, interferents and experimental variables are also investigated. Under working conditions, the proposed method was successfully applied to the simultaneous determination of phosphate and silicate in synthetic detergents.     

Polarographic determination of In(III) and Cd(II) in the presence of a crown ether

Summary The simultaneous determination of In(III) and Cd(II), whose reduction potentials are very close to each other, was investigated by polarography in the presence of a crown ether such as 12-Crown-4, 15-Crown-5, or 18-Crown-6. An addition of the crown ether shifts the reduction potential of In(III) towards the negative side, its current remaining unchanged, while that of Cd(II) almost did not change, also leaving the wave current constant. Therefore, the difference in reduction potentials between two ions became appreciably large for the simultaneous determination by polarography.     

Simultaneous kinetic-spectrophotometric determination of periodate-bromate and iodate-bromate mixtures using the H-point standard addition method

The H-point standard addition method (HPSAM), based on spectrophotometric measurement, for simultaneous determination of periodate-bromate and iodate-bromate mixtures is described. This method is based on the difference between the rates of their reactions with iodide in acidic media. The results showed that simultaneous determinations could be performed with the ratio 1:15-12:1 for periodate-bromate and 15:1-1:15 for iodate-bromate. The proposed method was successfully applied to the simultaneous determination of periodate-bromate and iodate-bromate in water and synthetic samples.     

Determination of polycyclic aromatic hydrocarbons in sediment by liquid chromatography-atmospheric pressure photoionization-mass spectrometry.

We describe a method for the simultaneous determination of 12 kinds of polycyclic aromatic hydrocarbons (PAHs) in sediment based on liquid chromatography-atmospheric pressure photoionization-mass spectrometry (LC/APPI/MS). The method consists of PAH extractions by ultrasonics, clean-up by a solid-phase extraction procedure and determination by LC/APPI/MS. The limits of the determination for PAHs in sediment using the proposed method ranged from 0.06 to 0.9 mg/kg. PAHs were detected by this method in sediment samples on the mg/kg level.     

Determination of alkyl benzyl and dialkyl dimethyl quaternary ammonium biocides in occupational hygiene and environmental media by liquid chromatography with electrospray ionisation mass spectrometry and tandem mass spectrometry

A new method for the simultaneous qualitative and quantitative determination of alkyl benzyl and dialkyl quaternary ammonium compounds (QACs) has been developed. Analysis is by reversed-phase high-performance liquid chromatography coupled with electrospray ionisation mass spectrometry. QACs are extremely amenable to the electrospray ionisation technique (limit of detection of BAC C12 homologue 3 ng ml(-1)). The selectivity of mass spectrometric detection allows simultaneous determination of benzyl and dialkyl dimethyl ammonium compounds. The method was successfully applied to the analysis of real samples (occupational hygiene sampling devices, products and swimming pool water). Structural information was obtained by MS-MS and cone voltage ion dissociation techniques. Ion dissociation enabled the structural elucidation of an unknown quaternary ammonium compound present in a commercial formulation.     

分光光度法同时测定多元素的研究 : 以CPA-矩阵法计算混合体系中Mo、W、Ti三元素的含量

本文将CPA-矩阵法用于光度分析中同时对多元素的测定, 确定了在SAF为显色剂、DTMAB为胶束增敏剂的配合体系中以CPA-矩阵法计算Mo、W、Ti三元素含量的各种最佳实验条件, 建立了在该体系中同时测定互相干扰的Mo、W、Ti三元素的分光光度法. 总结了进行多组份测定时选择分析波长的四项原则, 并依此确定了6个测定波长: 510、512、514、516、518、520nm为Mo、W、Ti三元素的测定波长. 依本文建立的方法, 通过对任意含量配比的三元素混合试样进行测定结果极为满意, 方法具有稳定、准确、简便、快速和经济等特点, 便于推广应用.     

Second and first-derivative spectrophotometry for efficient simultaneous and individual determination of palladium and cobalt using 1-(2-pyridylazo)-2-naphthol in sodium dodecylsulfate micellar media.

1-(2-Pyridylazo)-2-naphthol (PAN) has been used for the simultaneous and individual determination of palladium and cobalt at trace levels. PAN complexes of palladium and cobalt at neutral pH form green-color neutral complexes, which are soluble in aqueous SDS micellar media. Under optimum conditions, calibration graphs for individual determinations by zero and first-derivative spectrophotometry, and also for simultaneous determinations by second-derivative spectrophotometry were obtained. A zero-crossing method using second-derivative spectrophotometry at 628 or 578 and 614 nm, respectively, for cobalt and palladium was used for simultaneous determinations. The method is able to determine the cobalt-to-palladium ratio, 5:1 to 1:10 (Wt/Wt), accurately. The accuracy and reproducibility of the determination method for various known amounts of cobalt and palladium in their binary mixtures were tested. The effects of diverse ions on the determination of cobalt and palladium to investigate the selectivity of the method were also studied. The recommended procedures were applied to a synthetic binary alloy, cobalt in vitamin B12 and B-complex ampoules, a Co2O3-Co3O4 laboratorial chemical mixture, some synthetic cobalt-alloy samples, a Pd-charcoal catalyst, and some synthetic palladium alloys.     

高效液相色谱-串联质谱法检测牛奶中多种苯并咪唑兽药残留

采用正交试验优化的QuEChERS方法处理样品,建立了牛奶中包括前体药物和代谢物在内12种苯并咪唑类(BZs)兽药残留的高效液相色谱-串联质谱检测方法.方法在1～500μg/kg范围内线性良好,相关系数为0.9980～0.9996,平均回收率72.4%～108.3%,RSD为1.4%～9.7%,检出限低于0.5μg/k...     

乘子罚函数分光光度法测定安钠咖注射液的含量

本文报道将乘子罚函数法用于处理多波长吸光度数据,同时测定样品中多组分的含量。简要介绍了原理和计算步骤。对安钠咖注射液模拟样和实际样品中的咖啡因、苯甲酸钠进行了测定,１２份模拟样中咖啡因和苯甲酸钠的回收率分别为（１００．１６±０．５４）％和（９９．７４±０．３４）％（置信度９５％）,实际样品分析的结果与药典法一致。     

In-Solution Derivatization and Headspace Gas Chromatography–Mass Spectrometry for 56 Carbonyl Compounds in Tobacco Heating Products,Traditional Tobacco Products and Flavoring Capsules

Chromatographia - Optimal derivatization conditions were established for the simultaneous determination of 12 aliphatic saturated aldehydes, 8 aliphatic saturated ketones, 4 cyclic ketones, 3...