摘要:

An empirical spectrophotometric procedure for the determination of the antiemetic ondansetron is carried out. The method is based on the formation of a 1:1 ion pair with bromocresol green in the pH range over 3.2 – 4.4, extraction into chloroform layer and spectrophotometric measurement at 420.8 nm. The calibration graph is linear over the range 0.1 – 20 μg ml−1ondansetron, with a relative standard deviation of 2.7%; the influence of foreign substances is also studied. The method is applied to ondansetron determination in human urine.

ISSN:0003-2719    

DOI:10.1080/00032719608001784

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A flow injection method (FIA) has been developed for the determination of chloride with Hg-EDTA complex as reagent. Spectrophotometric detection in the ultraviolet region at 250 nm was used for measuring the absorbance of [HgYCl]3−complex ion, where H4Y is EDTA. A manifold consisting of two lines was used. The EDTA carrier and the Hg-EDTA reagent streams were buffered at pH 4.6 (Acetate buffer). This UV-FIA method has a detection limit of 0.2 ppm chloride. At a sampling rate of 60 samples per hour, with 50 μl sample injections, high reproducibility of measurements was achieved, with about 1% relative standard deviation. The method was used for the determination of chloride in natural waters and potable water supplies. The effects of sample volume, flow rate, coil length, and possible interferences on the FIA spectrophotometric signals were reported.

ISSN:0003-2719    

DOI:10.1080/00032719608001785

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

A sensitive kinetic spectrophotometric flow injection method has been developed for the determination of mercury(II) over the range 150–2700 ng. The method is based on the catalytic effect of this ion on the reduction reaction of safranin by iodide. Method development includes optimization of reagent concentrations, pH, reaction temperature, ionic strength and flow conditions. The optimized flow injection manifold yielded a detection limit of 90 ng Hg(II). Chemical interference studies showed that the method also has good selectivity. The method was applied to the determination of mercury in contact lense cleaning solution and human hair.

ISSN:0003-2719    

DOI:10.1080/00032719608001786

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Analytical atomic absorption/emission spectrometric methods have been developed for determination of 22 metallics at low concentration levels in high purity graphite material required in nuclear fuel industry. Of these, 21 metallics viz., Al,B, Be, Ca, Cd, Cr, Co, Cu, Fe, Li, Mn, Mo, Mg, Ni, Pb, Sn, Si, Ti, V, W and Zn are determined at trace concentration levels by D.C. arc Atomic Emission Spectrometric method using carrier excitation technique with a 6% carrier mixture of AgCl and NaF in a 5:1 proportion. Using the standardized procedure B, Be and Cd can be determined at 0.1 ppm concentrations while most of the other elements could be determined at 5–50 ppm concentrations. The detection limit for W was however 100 ppm. The precision of the method has been better than 20% RSD.

ISSN:0003-2719    

DOI:10.1080/00032719608001787

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

Simple and sensitive spectrophotometric determination of palladium(II) withO-sulfophenylfluorone(SPF) was proposed in the presence ofN-hexadecyltrimethylammonium chloride(HTAC) as a cationic surfactant. The calibration graph was linear up to 1.2 μg/ml palladium(II) by measuring the absorbance at 585 nm against a reagent blank. The apparent molar extinction coefficient (ε) was 1.2 × 1051 mol−1cm−1and Sandell's sensitivity was 0.00096 μg/cm2palladium(II) at 585 nm. The effect of foreign cations or anions was partially examined.

ISSN:0003-2719    

DOI:10.1080/00032719608001788

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0003-2719    

DOI:10.1080/00032719608001773

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor