Analytical Communications

A bacteria-modified carbon paste electrode has been prepared and used for the very sensitive and selective determination of trace amounts of gold(III). The modified electrode was able to detect a solution of 1.0 ppb Au(III) by applying cathodic stripping voltammetry. Advantages of the bacteria-modified electrode include high sensitivity, good stability, low cost and simple preparation. It could be a new class of modified electrode with practical value.

Rongzong Hu

Weide Zhang

Jinkun Fu

Yueying Liu

Determination of trace amounts of gold(III) by cathodic stripping voltammetry using a bacteria-modified carbon paste electrode

利用细菌修饰碳糊电极的阴极 stripping 伏安法测定微量金(III)

Determination of iodine in glacial acetic acid is a major concern of acetic acid manufacturers and consumers. The use of ICP-MS for iodine determinations in acetic acid is hindered by memory effects that produce an elevated background signal necessitating long rinse times between samples. In this work, different analysis methods are employed in an attempt to minimize memory and matrix effects allowing for the accurate determination of iodine in glacial acetic acid using ICP-MS. Ammonium hydroxide solutions (3.7 and 7.4 M) were better at reducing the elevated iodine signal present after the introduction of an acetic acid sample than water or 0.3 M nitric acid. Memory effects were decreased when the sample was introduced by flow injection rather than constant sample aspiration. Peak areas generated by flow injection decreased significantly with increasing ammonium hydroxide concentration in the carrier solution. Iodine determinations made with 1.7 M ammonium hydroxide as the carrier solution were higher than determinations made with 3.7 M ammonium hydroxide as the carrier solution for the same samples, however, the percentage difference between the two determinations varied widely from sample to sample. All samples were analyzed by the method of standard additions in an attempt to compensate for matrix effects. This work illustrates the importance of the carrier solution in the determination of iodine in glacial acetic acid samples.Introduction

Kathryn L. Ackley

Jason A. Day

Karen L. Sutton

Joseph A. Caruso

Investigation of problems associated with the determination of iodine in glacial acetic acid samples using flow injection analysis-inductively coupled plasma-mass spectrometry†

使用流动注射分析-电感耦合等离子体质谱法测定冰醋酸样品中碘的相关问题调查†

The possibility of using capillary isotachophoresis coupled with on-column conductivity detection for the separation of complex metal cation mixtures has been demonstrated. The simultaneous separation of a mixture of the 21 metal cations Ca2+, Mg2+, Mn2+, Co2+, Ni2+, Zn2+, Be2+, La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Cu2+, Y3+, Ho3+, Er3+, Tm3+, Yb3+ and Lu3+ has been reproducibly achieved using aqueous electrolytes. Calibration curves were produced for two of these ions, Co2+ and Er3+. A linear response was observed over the range from 0.02 mmol dm–3 to 1.70 mmol dm–3 for cobalt and 0.05 mmol dm–3 to 1.00 mmol dm–3 for erbium. These curves allowed limits of detection to be calculated as 0.015 mmol dm–3 for cobalt and 0.045 mmol dm–3 for erbium.

Jeff E. Prest

Peter R. Fielden

The simultaneous separation of twenty-one metal cations using capillary isotachophoresis with on-column conductivity detection

使用柱上电导检测的毛细管等速电泳同时分离二十一种金属阳离子

Near-infrared (NIR) reflectance spectroscopy has been used to monitor the chemical inter-conversion of resin-bound functional groups. Measurements required no sample preparation and were made directly through the bottom of the glass reaction vessel. The time–concentration profile of the esterification of a resin-bound alcohol by acetic anhydride in a toluene medium is demonstrated.

Jonathan Hammond

Anthony C. Moffat

Roger D. Jee

Barrie Kellam

Non-destructive real-time reaction monitoring in solid phase synthesis by near-infrared reflectance spectroscopy—esterification of a resin-bound alcohol

近红外反射光谱在固相合成中的无损实时反应监测——树脂结合醇的酯化反应

The sorption and elution of In(III) on a porous PTFE filter tube impregnated with bis(2-ethylhexyl) hydrogen phosphate (HDEHP) was studied. A 1 µg portion of In(III) in 1000 ml of sample solution was quantitatively complexed with HDEHP adsorbed onto a porous PTFE filter tube by passing the solution through the micropores of the filter tube. Preconcentrated In(III) was then quantitatively recovered provided that the elution, which consisted of cyclical filtering of 0.1 ml of 4 mol l–1 hydrochloric acid through the filter tube for 1 min, was repeated 3 times. The total volume of the eluent was only 0.3 ml in this case; therefore, over 3300-fold of enrichment was attained within 90 min of total preconcentration time. This method was applicable to the preconcentration of In(III) in highly saline samples. A 2.5 µg portion of In(III) could be quantitatively extracted from 500 ml of synthetic seawater and be recovered into 0.5 ml of 4 mol l–1 hydrochloric acid, with subsequent determination by flame AAS. The average recovery and the RSD of the results were 100% and of 1.4%, respectively (n = 5).

Masahiko Murakami

Takeo Takada

Novel sorbent extraction technique using a chelating agent impregnated porous PTFE filter tube: preconcentration of In(III) with a bis(2-ethylhexyl) hydrogen phosphate (HDEHP) loaded porous PTFE filter tube

新型吸附剂提取技术：使用负载双（2-乙基己基）磷酸（HDEHP）的聚四氟乙烯（PTFE）滤管预浓缩铟(III)

Publication Information	Publisher: Royal Society of Chemistry，Publishing cycle: ，Journal Type: journal，Open Access Journals: No
Basic data	Year of publication: 1996，Proportion of original research papers: ，Self Citation Rate:， Gold OA Rate:

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Determination of trace amounts of gold(III) by cathodic stripping voltammetry using a bacteria-modified carbon paste electrode

Investigation of problems associated with the determination of iodine in glacial acetic acid samples using flow injection analysis-inductively coupled plasma-mass spectrometry†

The simultaneous separation of twenty-one metal cations using capillary isotachophoresis with on-column conductivity detection

Non-destructive real-time reaction monitoring in solid phase synthesis by near-infrared reflectance spectroscopy—esterification of a resin-bound alcohol

Novel sorbent extraction technique using a chelating agent impregnated porous PTFE filter tube: preconcentration of In(III) with a bis(2-ethylhexyl) hydrogen phosphate (HDEHP) loaded porous PTFE filter tube

Determination of trace amounts of gold(III) by cathodic stripping voltammetry using a bacteria-modified carbon paste electrode

Investigation of problems associated with the determination of iodine in glacial acetic acid samples using flow injection analysis-inductively coupled plasma-mass spectrometry†

The simultaneous separation of twenty-one metal cations using capillary isotachophoresis with on-column conductivity detection

Non-destructive real-time reaction monitoring in solid phase synthesis by near-infrared reflectance spectroscopy—esterification of a resin-bound alcohol

Novel sorbent extraction technique using a chelating agent impregnated porous PTFE filter tube: preconcentration of In(III) with a bis(2-ethylhexyl) hydrogen phosphate (HDEHP) loaded porous PTFE filter tube