Determination of U(VI) as a chloranilic complex. (Method by Prof. G. Henze, Dr. S. Sander and Dr. W. Wagner; University of Kaiserslautern; University of Trier).

AN-V-042

Mercury in soybean oil after digestion

Determination of Hg in soybean oil after cold extraction with HNO₃.

AN-V-041

Cadmium, lead, copper, nickel and cobalt in soybean oil after digestion

Determination of Cd, Pb, Cu, Ni and Co in soybean oil after extraction by boiling with HCl under reflux

AN-V-040

Aluminum and chromium in whiskey after digestion

Determination of Al (as DASA complex) and Cr (as DTPA) in whiskey after UV digestion.

AN-V-039

Zinc, cadmium, lead and copper in whiskey after digestion

Determination of Zn, Cd, Pb and Cu in whiskey after UV digestion.

AN-V-037

Arsenic in chili sauce after digestion

Determination of As in chili sauce after digestion

AN-V-036

Mercury in chili sauce after digestion

Determination of Hg in chili sauce after digestion

AN-V-035

Zinc, cadmium, lead and copper in chili sauce after digestion

Determination of Zn, Cd, Pb and Cu in chili sauce after digestion

AN-V-033

Zinc, lead, copper and iron in sugar

Determination of Zn, Pb, Cu and Fe in sugar after wet digestion.

AN-V-032

Zinc, cadmium, lead, copper, iron, nickel and cobalt in freeze-dried hops

Determination of Zn, Cd, Pb, Cu, Ni, Co and Fe in freeze-dried hops after a wet digestion.

AN-V-031

Coumarin and tartrazine in vodka

Determination of coumarin and tartrazine in vodka

AN-V-004

Zinc, cadmium, lead, copper and chromium in triglyceride

Determination of Zn, Cd, Pb, Cu and Cr in triglyceride

AN-S-263

Nitrite in the presence of a high concentration of chloride on the Metrosep A Supp 16 – 250

Determination of nitrite in the presence of a 1000 times higher chloride content using anion chromatography with conductivity detection after chemical suppression.

AN-N-040

Cyanide in a standard solution using the Metrosep A Supp 1 column

Determination of cyanide using anion chromatography with amperometric detection at the silver electrode.

AN-N-002

Determination of methylarsonic acid and dimethylarsinic acid

Determination of methylarsonic acid and dimethylarsinic acid using anion chromatography with direct conductivity detection.

AN-I-009

Cyanide content of wastewater

Determination of cyanide in wastewater by direct potentiometry with the Cyanide ISE.

AN-C-061

Zinc and manganese in the presence of standard cations in an extract of a zinc compound

Determination of zinc, sodium, ammonium and manganese in the presence of magnesium and calcium in an extract of a zinc compound using cation chromatography with direct conductivity detection.

AB-300

Determination of cyanide in process water of the steel industry

The production of steel involves many different materials and procedures. In order to achieve a smooth, reliable production process and obtain a good product quality, the materials and procedures have to be controlled very thoroughly. One important component in the steel production is process water that is used for cooling the blast
furnace and for washing and cleaning the top gases (blast-furnace gases). After top gas purification the scrubbing water contains dissolved cyanide and the water can only be returned to the public sewage system if the cyanide concentration is below the legal limits.
The ProcessLab setup described here offers a measurement and monitoring solution and provides various options for reacting to any situation. With the aid of the input/output controller, the measured analytical values are easily transferred to the process control center in the form of 4…20 mA analog signals. On the basis of these values, all further process steps are initiated and controlled automatically in the process control center.

AB-196

Polarographic determination of formaldehyde

Formaldehyde can be determined reductively at the DME. Depending on the sample composition it may be possible to determine the formaldehyde directly in the sample. If interferences occur then sample preparation may be necessary, e.g. absorption, extraction, or distillation.
Two methods are described. In the first method formaldehyde is reduced directly in alkaline solution. Higher concentrations of alkaline or alkaline earth metals interfere. In such cases the second method can be applied. Formaldehyde is derivatized with hydrazine forming the hydrazone, which can be measured polarographically in acidic solution.

AB-116

Polarographic/voltammetric determination of chromium in small quantities

Methods are described for the polarographic and voltammetric determination of small amounts of chromium in water, wastewater and biological materials. Sample pretreatment in different matrices is described. Depending on the method, the determination limits lie at mass concentrations of 10 µg/L, or 1 µg/L, or 0.02 µg/L.

AB-096

Determination of mercury at the rotating gold electrode by anodic stripping voltammetry

This Application Bulletin describes the determination of mercury by anodic stripping voltammetry (ASV) at the rotating gold electrode. With a deposition time of 90 s the calibration curve is linear from 0.4 μg/L to 15 μg/L; the limit of quantification is 0.4 μg/L.
The method has primarily been drawn up for investigating water samples. After appropriate digestion the determination of mercury is possible even in samples with a high load of organic substances (wastewater, food and semi-luxuries, biological fluids, pharmaceuticals).

8.000.6064EN

Microbore columns: a contribution to green chemistry

Available sample size, mass sensitivity, efficiency and the detector type are important criteria in the selection of separation column dimensions. Compared to conventional 4 mm i.d. columns, microbore columns excel, above all, by their low eluent consumption. Once an eluent is prepared, it can be used for a long time. Additionally, the lower flow rates of microbore columns facilitate the hyphenation to mass spectrometers due to the improved ionization efficiency in the ion source.

With the same injected sample amount, a halved column diameter involves a lower eluent flow and results in an approximate four-fold sensitivity increase. In a converse conclusion, this means that with less sample amount, microbore columns achieve the same chromatographic sensitivity and resolution than normal bore columns. This makes them ideally suited for samples of limited availability.

8.000.6039EN

Mercury and arsenic speciation analysis by IC-ICP/MS

By means of IC-ICP/MS, different valence states of arsenic and mercury in the form of inorganic and organic species can be sensitively and unambiguously identified in one single run. Determination of common arsenic species in biological matrices is straightforward and can be performed down to the sub-ppb level.
Species transformations of mercury that occur during several sample preparation techniques, however, require the use of specific isotope dilution mass spectrometry (SIDMS). This work illustrates the decisive advantage that Environmental Protection Agency (EPA) Method 6800 (SIDMS) offers for studying the transformations of mercury species during sample preparation of fish tissue samples. Because of the unique features and benefits of EPA Method 6800, it is expected that utilization of SIDMS will increase and that this valuable tool for optimizing and validating trace-metals-speciated sample preparation will gain much wider acceptance by analytical chemists.