Aufschlu� biologischer Matrices f�r die Bestimmung sehr niedriger Spurenelementgehalte bei begrenzter Einwaage mit Salpeters�ure unter Druck in einem Teflongef��

Kotz, L.; Kaiser, G.; Tschöpel, P.; Tölg, G.

doi:10.1007/bf00431498

Cited by 247 publications

(19 citation statements)

References 2 publications

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“…It consists of a heating block which admits 10 pressure Containers within each of which there is one poly tetrafluorethylen (PTFE) vessel. The lid of this vessel is closed with a spring at 50 kp/mm [23]. The PTFE vessels were boiled for 15-20 minutes in 30% nitric acid and subsequently rinsed several times with demineralized water.…”

Section: Processingmentioning

confidence: 99%

The trace elements chromium, manganese, copper and zinc in fetal liver tissue

Seeling¹,

Fw²,

Dick³

et al. 1977

Journal of Perinatal Medicine

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Section: Processingmentioning

confidence: 99%

The trace elements chromium, manganese, copper and zinc in fetal liver tissue

Seeling¹,

Fw²,

Dick³

et al. 1977

Journal of Perinatal Medicine

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“…Samples are held at 250-300 o C for 3-6 h in most procedures. Tölg and coworkers 20 and Bernas 21 proposed the use of pressurized PTFE bombs, small masses of sample (200 to 500 mg) plus acid or a mixture of acids, and pointed out that increasing temperatures speed up the decomposition. Tölg's bombs are used especially in trace element analysis with organic, biological and inorganic samples, alloys, metals, and minerals.…”

Section: Wet Decomposition-thermal Energymentioning

confidence: 99%

“…Tölg's bombs are used especially in trace element analysis with organic, biological and inorganic samples, alloys, metals, and minerals. An adapted pressure decomposition Tölg's bomb is shown in Figure 1 6,18,20 as employed nowadays. It is constituted of: pressure valve, screw-cap, pressure spring, metal lid, PTFE lid, PTFE insert and a pressure vessel (lined with stainless steel and thermal insulation).…”

Section: Wet Decomposition-thermal Energymentioning

confidence: 99%

Sample preparation for atomic spectroscopy: evolution and future trends

Oliveira¹

2003

J. Braz. Chem. Soc.

140

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A preparação da amostra é a etapa crítica dentro de um protocolo analítico e envolve desde a simples diluição até a solubilização parcial ou total. Métodos de decomposição por via seca ou úmida, envolvendo o aquecimento das amostras em sistemas abertos ou fechados, utilizando várias formas de energia como térmica, ultra-som ou radiante (infravermelho, ultravioleta e microondas) são empregados. O presente e o futuro da preparação de amostras consideram também solubilização em linha de amostras, lixiviação dos analitos de interesse, especiação, análise de suspensão, análise in situ, in vivo etc. Ênfase foi dada para o preparo de amostras para espectroscopia atômica. Atualmente, os objetivos a serem alcançados envolvem a obtenção do melhor resultado, no menor tempo, com mínima contaminação, pouco gasto de reagente e pequena geração de resíduos e efluentes, bem como a integridade das amostras e traceabilidade dos resultados, tendo em mente a qualidade e confiança nos resultados de medições, como requerido pela comunidade e usuários.Sample preparation is the critical step of any analytical protocol, and involves steps from simple dilution to partial or total dissolution. The methods include dry or wet decomposition of the samples in open or closed systems, using thermal, ultrasonic or radiant (infrared, ultraviolet and microwaves) energy. This review emphasizes sample preparation for atomic spectroscopy. The present and future tendencies for sample preparation also involve on-line dissolution, extraction of the analytes, speciation, solid sample and slurry analysis, in situ and in vivo procedures, etc. Nowadays the goals are the best result, in the shortest time, with minimum contamination, using the smallest quantities of reagents and samples, and having low residue and waste generation, as well as maintaining the integrity of the sample and the traceability of the results, to have quality and confidence in the measurements as the primordial attributes required by the community and by the users.

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“…Aliquots of about 5 mg dried material were first digested with 50 juJ HNO 3 (70-71 %, Baker Instra-Analysed) in 1.5 ml polypropylene Eppendorf tubes (4 h; 96°C) and then treated with 20 nl H 2 O 2 (30%, suprapure, Merck; 1 h; 56°C). This procedure had been validated by comparison with a pressure digestion method (Kotz et al 1972;Zauke et al 1986). Precautions were taken to avoid contamination: the digested samples came into contact with only the polypropylene reaction tubes and white micropipette tips (Finnpipette Ky, Helsinki).…”

Section: Analytical Proceduresmentioning

confidence: 99%

Cadmium, lead, copper, and zinc inElminius modestusDarwin (Crustacea, Cirripedia) from Waitemata and Manukau Harbours, Auckland, New Zealand

Zauke

Harms

Foster

1992

New Zealand Journal of Marine and Freshwater Research

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Concentrations of cadmium (Cd), lead (Pb), copper (Cu), and zinc (Zn) were measured in adult barnacles (Elminius modestus Darwin) from Waitemata and Manukau Harbours in the Auckland area, New Zealand. As in studies on sediments reported in the literature, it was possible to identify areas of likely anthropogenic influence, e.g., around the Auckland Harbour Bridge for Pb, Cu, and Zn. Groups of individuals with highest concentrations for these metals showed 19.

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Aufschlu� biologischer Matrices f�r die Bestimmung sehr niedriger Spurenelementgehalte bei begrenzter Einwaage mit Salpeters�ure unter Druck in einem Teflongef��

Cited by 247 publications

References 2 publications

The trace elements chromium, manganese, copper and zinc in fetal liver tissue

The trace elements chromium, manganese, copper and zinc in fetal liver tissue

Sample preparation for atomic spectroscopy: evolution and future trends

Cadmium, lead, copper, and zinc inElminius modestusDarwin (Crustacea, Cirripedia) from Waitemata and Manukau Harbours, Auckland, New Zealand

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