Atomic adsorption spectrometry

For each synthesis, a reactant mixture was placed in a stainless autoclave with an agitator. The crystallization was carried out in a temperature range 90°-200°C for 20-72 h. The solid product was filtered, washed and dried. Zeolite was identified by powder X-ray diffraction measurement. Chemical analysis was conducted by atomic adsorption spectrometry. 

Pierce FD, Gortatowski MJ, Mecham HD, et al. 1975. Improved automated extraction method for atomic adsorption spectrometry. Analytical Chemistry 47 1132-1135. 

Larsen EH, Rasmussen L. 1991. Chromium, lead and cadmium in Danish milk products and cheese determined by Zeeman graphite furnace atomic adsorption spectrometry after direct injection or pressurized ahsing. ZLebensm Unters Forsch 192 136-141. 

In this method organotin compounds were extracted from dried sewage sludges with dichloromethane converted to inorganic tin and determined using atomic adsorption spectrometry (AAS). 

MEASUREMENT METHODS Particulate filter acid atomic adsorption spectrometry inductively coupled plasma. 

This field provides a brief description of the suggested monitoring and analysis method for quantitative determination of a particular substance. For example, a method for quantitative determination has been developed for cadmium, copper, manganese, and lead in water by means of co-precipitation with zirconium hydroxide followed by subsequent analysis by atomic adsorption spectrometry. An Inductively Coupled Plasma-Atomic Emission Spectrophotometric method has been employed by the Environmental Protection Agency (EPA Method 200.7) for the determination of dissolved, suspended, or total elements in drinking water, surface water, and domestic and industrial wastewaters. 

Metallic cations in milk and dairy products (including sodium, potassium, calcium, and heavy metal contamination) may be measured by flame photometry (Na, K ) or atomic adsorption spectrometry (AAS) (other elements) in which the sample is atomized in the gas flame and the adsorption is measured at the characteristic wavelength of each element. 

The catalysts chemical composition was analyzed by EDAX method (JEM-35CF SEM, Jeol Co. Japan) excluding Li, which was detected by atomic adsorption spectrometry (Varian Spectrometer AA 375) after dissolution of sample. The catalysts surface area was measured (BET method, ASTM D3663-84). 

MegEtPb, Me2Et2Pb, MeEt Pb, and Et Pb) from water, sediment, and fish samples. The extracted compounds are analyzed in their authentic forms by a gas chromatographic-atomic adsorption spectrometry system. Other forms of inorganic and organic lead do not interfere. The detection limits for water (200 ml), sediment (5 g), and fish (2 g) are 0.50yg/l, 0.01 yg/g, and 0.025 yg/g, respectively. Whilst this method would be applicable to the determination of tetraalkyllead compounds... 

Adsorption on basic anion exchange resin Atomic absorption spectrometry < 10 2.16 [253]... 

Adsorptive cathodic stripping voltammetry has an advantage over graphite furnace atomic absorption spectrometry in that the metal preconcentration is performed in situ, hence reducing analysis time and risk of contamination. Additional advantages are low cost of instrumentation and maintenance, and the possibility to use adapted instrumentation for online and shipboard monitoring. 

Copper Adsorption on Qg resin Laser excited atomic fluorescence spectrometry with a graphite electrothermal atomiser 0.001 pg/1 [241]... 

Chemical composition of fresh HTs was determined in a Perkin Elmer Mod. OPTIMA 3200 Dual Vision by inductively coupled plasma atomic emission spectrometry (ICP-AES). The crystalline structure of the solids was studied by X-ray diffraction (XRD) using a Siemens D-500 diffractometer equipped with a CuKa radiation source. The average crystal sizes were calculated from the (003) and (110) reflections employing the Debye-Scherrer equation. Textural properties of calcined HTs (at 500°C/4h) were analyzed by N2 adsorption-desorption isotherms on an AUTOSORB-I, prior to analysis the samples were outgassed in vacuum (10 Torr) at 300°C for 5 h. The specific surface areas were calculated by using the Brunauer-... 

Note TLC, thin-layer chromatography HPLC, high-performance liquid chromatography GLC or GC, gas-liquid chromatography AA, atomic adsorption NPD, nitrogen phosphorus detector FPD, flame photometric detector GC/MS, gas chromatography/mass spectrometry. 

Reddy et al. [121] studied the speciation of selenium in groundwaters by adsorption of selenite and selenate onto copper oxide particles followed by hydride generation atomic absorption spectrometry and ion chromatography. 

Detection techniques of high sensitivity, selectivity, and ease of coupling with sample preparation procedures are of special interest for measuring PGM content in biological and environmental samples. ICP MS, electrothermal atomic absorption spectrometry (ET AAS), adsorptive voltammetry (AV), and neutron activation analysis (NAA) have fotmd the widest applications, both for direct determination of the total metal content in the examined samples and for coupling with instrumental separation techniques. Mass spectrometry coupled with techniques such as electrospray ionization (ESI) and capillary electrophoresis (CE) (e.g., ESI MS", LC ESI MS", LC ICP MS, CE MS", and CE ICP MS) offer powerful potential for speciation analysis of metals. MS is widely used for examination of the distribution of the metals in various materials (elemental analysis) and for elucidation of the... 

Zimmermann, S., Messerschmidt, J., von Bohlen, A., Sures, B. Determination of platinum, palladium and rhodium in biological samples by electrothermal atomic absorption spectrometry as compared with adsorptive cathodic stripping voltammetry and total-reflection X-ray fluorescence analysis. Anal. Chim. Acta 498, 93-104 (2003)... 

The precursor and the calcined catalyst were characterized by various techniques such as nitrogen adsorption, mercury porosimetry, X-ray diffraction (XRD), atomic emission spectrometry by inductively coupled plasma (ICP), thermogravimetric analysis, and temperature-programmed reduction (TPR). More details about the catalyst preparation and characterization can be found in a previous work (22). 

Solutions of constant metal concentrations at various pH values were added to aqueous suspensions of carbon pre-conditioned at the same pH. The amoimt of metal introduced was calculated by taking into consideration a monolayer of metallic precursor on the carbon surface, neglecting the area developed by the micropores. It corresponds to a loading of Pd(9.52wt%)/C or Au(9.52wt%)/C. The amount of non-adsorbed Pd or Au was determined after 24 hours by atomic absorption spectrometry of the adsorption filtrates. 

Methods for quantitative analysis of Co indude flame and graphite-furnace atomic absorption spectrometry (AAS e.g., Welz and Sperling 1999), inductively coupled plasma emission spectrometry (ICP-AES e.g., Schramel 1994), neutron activation analysis (NAA e.g., Versieck etal. 1978), ion chromatography (e.g., Haerdi 1989), and electrochemical methods such as adsorption differential pulse voltammetry (ADPV e.g., Ostapczuk etal. 1983, Wang 1994). Older photometric methods are described in the literature (e.g.. Burger 1973). For a comparative study of the most commonly employed methods in the analysis of biological materials, see Miller-Ihli and Wolf (1986) and Angerer and Schaller... 

Measured by atomic absorption spectrometry. Reference untreated NaY. c).d) Low pressure argon adsorption. t-Plot method of Lippens-De Boer, Harkins-Jura equation. 

BIOLOGICAL PROPERTIES surface water samples have concentrations ranging from 5 to 336 pg/L seawater concentration 3.0 pg/L highly persistent in water, with a half-life of more than 200 days can be detected in water by digestion followed by silver diethyldithiocar-bamate, atomic adsorption, or inductively coupled plasma optical emission spectrometry... 

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