ICP applications

The analysis of soils and plant material are common examples used to demonstrate ICP applications. Dahlquist and Knoll(43) compared the preparation and ICP analyses of botanicals (16 elements) and soils (11 elements) with few exceptions the ICP values for the CII botanicals were in excellent agreement with the assigned values, and the soil analyses were in excellent agreement with FAA analyses of soil digests. )ones( 4) reported the analysis of 17 elements in plant material and soils but confirmation of the two analyses was not given. Alder, et. aJ.(75) describe the unique analysis of ammonia-nitrogen in soils by gas evolution into an ICP no interferences were observed from the concomitants evaluated and acceptable recoveries were obtained. Irons et. al.(76) compared the ICP analyses of 13 elements in NBS orchard leaves and bovine liver to the data obtained by FAA and energy dispersive x-ray. 

Solid substances such as AgCl and also PTFE powder can be used as thermochemical reagents (see e.g. Ref. [191] for an ICP application). In the case of Ti in the presence of C and PTFE the following reactions have to be considered ... 

For direct dilution organics ICP approaches, modified ASTM D 5185 and D 4951 methods were used in our laboratory. O-xylene is the solvent of choice, and intemal standard is used for all organic ICP applications. 

Activated alumina is a sorbent which is characterized by long-teim stability under both acidic and basic conditions. It has been used quite often as column packing in ICP applications, particularly in its acidic form, for the pre concentration of oxyanions... 

Laser based mass spectrometric methods, such as laser ionization (LIMS) and laser ablation in combination with inductively coupled plasma mass spectrometry (LA-ICP-MS) are powerful analytical techniques for survey analysis of solid substances. To realize the analytical performances methods for the direct trace analysis of synthetic and natural crystals modification of a traditional analytical technique was necessary and suitable standard reference materials (SRM) were required. Recent developments allowed extending the range of analytical applications of LIMS and LA-ICP-MS will be presented and discussed. For example ... 

ICPMS can be considered a high-sensitivity extension of mass spectrometry, as well as an increased-sensitivity detector replacing optical ICP (ICP-OES) analysis. In fret, both viewpoints are accurate, and the wide application of ICPMS analysis... 

ICP-OES is one of the most successful multielement analysis techniques for materials characterization. While precision and interference effects are generally best when solutions are analyzed, a number of techniques allow the direct analysis of solids. The strengths of ICP-OES include speed, relatively small interference effects, low detection limits, and applicability to a wide variety of materials. Improvements are expected in sample-introduction techniques, spectrometers that detect simultaneously the entire ultraviolet—visible spectrum with high resolution, and in the development of intelligent instruments to further improve analysis reliability. ICPMS vigorously competes with ICP-OES, particularly when low detection limits are required. 

Parts I and II. John Wiley and Sons, New York, 1987. An excellent description of the fundamental concepts, instrumentation, use, and applications of ICP-OES. 

Clearly, ICPs will not find application solely on their conductivity. They do, however, offer an Interesting range of properties in addition to conductivity, such as ... 

As indicated in Table 31.4, the potential of ICPs is in somewhat esoteric applications. In some instances the potential has reached commercial realisation. For example, coating the walls of boreholes in circuit boards before electroplating with copper involves fewer stages than with older established processes and is claimed to be cost effective, faster and simpler. ICPs are also now being marketed in Japan for use in solid electrolyte conductors. 

According to the procedure of sol deposition described in Section 2.3, more than 10% Au can be deposited on XC72R, thus allowing the use of the catalysts in fuel cells and other electrochemical applications [36]. In all the experiments the common mother gold solution 1 (Section 2.3) was used containing a low PVA amount (PVA Au = 0.05) in order to facilitate the adsorption step. Table 8 shows the results. According to ICP analysis, an almost total gold adsorption was obtained. 

Inductively coupled plasma Plasmas generated by application of radiofrequency power to a nonresonant inductive coil and maintained by an inductive electromagnetic field. Low-pressure ICP is a high-density plasma source. 

Hintelmann H, Evans RD. 1997. Application of stable isotopes in environmental tracer studies — measurement of monomethyhnercury (CKjEg ) by isotope dilution ICP-MS and detection of species transformation. Fresenius J Anal Chem 358 378-385. 

McLaren JW, Siu KWM, Lam JW, Maxwell PS, Koether M, Palepu A, and Berman SS (1990) Application of ICP-MS in marine analytical chemistry. Anal Chem 337 721-728. 

Identification of sources of analytical bias in method development and method validation is another very important application of reference materials in geochemical laboratories. USGS applied simplex optimization in establishing the best measurement conditions when the ICP-AES method was introduced as a substitute for AAS in the rapid rock procedure for major oxide determinations (Leary et al. 1982). The optimized measurement parameters were then validated by analyzing a number of USGS rock reference samples for which reference values had been established first by classical analyses. Similar optimization of an ICP-AES procedure for a number of trace elements was validated by the analysis of U S G S manganese nodule P-i (Montaser et al. 1984). 

Horn I, Rudnick RL, McDonongh WF (2000) Precise elemental and isotope ratio determination by simultaneous solution nebnlization and laser ablation-ICP-MS Application to U-Pb geochronology. ChemGeol 164 281-301... 

Raptis K, Mayer K, Hendrickx F, De Bievre P (1998) Preparation and certification of new thorium isotopic reference materials. Fresenius J Anal Chem 361 400-403 Rehkamper M, Halliday AN (1999) The precise measurement of T1 isotopic compositions by MC-ICP-MS Application to the analysis of geological materials and meteorites. Geochim Cosmochim Acta 63 935-944... 

There are a few drawbacks to this method. Using 4 or 5 TIMS measurements to produce a U-series date profile across a bone is time consuming, although a single reliable U-series date is surely worth hundreds where the accuracy is not known. In future, the application of Laser-Ablation ICP-MS to measuring profiles will significantly reduce the analytical effort required to obtain a date. 

Some selected applications (chemical class, mobile phase, stationary phase, column, detector) are as follows fatty acids, C02, PEG or CN-PS, OTC, FID organotin, C02, PhMe-PS, OTC, FPD [305], ThepSFC-ICP system is an effective tool for speciation of metal-containing compounds [362], even in the presence of modifiers to control the retention of components. 

Applications High-temperature liquid chromatography with packed-capillary columns, nonaqueous mobile phases, and ELSD and ICP-MS detection, has been developed specifically as a robust analytical tool for the analysis of high-MW polymer additives [731,738]. Dissolving such moderately polar, heavy compounds with low water solubility at ambient temperature usually... 

Mono-, di- and tributyltin ion species (in water) have been determined by cation exchange IC-ICP-MS at 0.2 ng detection limits [856]. IC is also particularly useful for HSE purposes, such as the determination of acid gases in the workplace. Applications of IC have been reviewed [857]. 

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