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This paper studied the trace elements Cs, Th and U in ten kinds of human autopsy tissues by ICP-MS. The instrumental operating conditions were optimized for the measurement of Cs, Th and U. Rhodium (Rh) was used as an internal standard element to compensate matrix effect. Detection limits for Th, U and Cs were 5.7-17.8 pg x mL(-1). The recoveries for spiking liver samples were 96%-107%, and their RSDs were 4.8%-8.9%. Reference materials of NIST SRM 8414 Bovine and NIST SRM 1486 Bone Meal were analyzed by the described method, and the analytical results agreed well with the reference values. Human autopsy tissues samples were digested by mixed acid (HNO3 + HClO4). The determination of Cs, Th and U in lung, liver, bone, heart, stomach, spleen, muscle, kidney, thyroid gland and intestinum tenue was performed by ICP-MS without separation and enrichment procedures. The obtained results indicated that this method is rapid, sensitive and accurate; the distribution of the three elements is different from one to another human organ sample; the main organ targets for Th and U are lungs and kidneys; and a coordinated variation of Cs, Th and U concentration in lungs was found in the samples collected from Hebei and Sichuan provinces.
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PMID:[Determination of trace Cs, Th and U in ten kinds of human autopsy tissues by ICP-MS]. 1576 38

In recent years, the study on palaeodiet is an important research in the international archaeological field. Trace elements in human bones can supply a lot of valuable information to reconstruct ancient diet. In this study, The trace elements in Bronze age Cheshi human costa from Chubeixi cemetery in shanshan, Xinjiang were determined by ICP-AES. The sample was dissolved by HNO3 and HCl. Under the optimum conditions, eight elements can be determined simultaneously. The recoveries of the method are in the range of 87.4%-106.6%, and RSDs are in the range of 0.5%-3.3%. The method is simple, rapid, precise and convenient to operate. The results would be helpful for research in archaeology. This analysis established Xinjiang' s consult system of trace elements analysis for ancient human bones. The effects of various concentrations of acid solution on analysis results, the interference of coexistent elements, standard addition recovery, and precision of the method were investigated.
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PMID:[Determination of trace elements in ancient Cheshi human costa by ICP-AES]. 1576 23

EDTA-cellulose was prepared by chloroacetic acid covalently bound to filter flakes. Fe, Cu, Zn, V, Mn, Co, Ni, Al, Cd and Pb were preconcentrated on microcolumn filled with EDTA-cellulose and analyzed with ICP-AES after being eluated with dilute HNO3. At given pH value, alkali and alkaline earth metal ions can be quantitatively separated as matrix elements, and did not interfere eluate determine. High concentration factor was obtained. The usefulness of the method is shown by analyses of Standard Reference Materials.
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PMID:[Multi-elemental analysis by preconcentration on EDTA-cellulose microcolumn coupled to ICP-AES]. 1581 Feb 22

A new method has been developed for simultaneous derermination of 16 elements in decoction solution of Chinese herbal medicine by ICP-AES after pretreatrment the solution with HNO3-H2O2. This method has low and stable blank value. The detection limits of 0.1-5ng/ml for most elements and recoveries of 85-103% were obtained. This method has been applied to the determination of 16 elements in decoction solution of chinese herbal medicine with satisfactory reswls.
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PMID:[Simultaneous determination of 16 elements in decoction solution of Chinese herbal medicine by ICP-AES]. 1581 Mar 69

Direct determination of the contents of 19 major or trace elements: K, Na, Ca, Mg, Si, Al, Fe, P, Sr, Ti, Mn, Zn, Pb, B, Ba, Cu, Li, V and Ni in plant samples by ICP-AES are reported in this paper. The solution of plant standard sample GBW07603 was prepared by five pretreatment methods: dry-ashing, HNO3 + H2SO4 + HClO4, H2SO4 + H2O, HNO3 + H2SO4 + HClO4 + HF and ashing + NaOH method. Suitable pretreatment methods were found for the determination of the elements by comparing standard deviations and relative errors of the results, thus providing a scientific basis for the selection of suitable pretreatment of chemical element analysis in plants.
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PMID:[Comparative studies on five pretreatment methods in the determination of elements in plant standard sample by ICP-AES]. 1581 59

The determination of metal elements in Chinese medicine wild jujube seed decoction was studied by ICP-AES after HNO3-H2O2 digestion. The average recoveries of the method for Ca, Cr, Al, Fe, K, Mg, Mn and Zn in wild jujube seed decoction were found to be 95.5%-106.8%, while RSD (n=5) was found to be 1.7%-3.9% for these metal elements. The method was applied to the analysis of some practical samples and the results obtained were satisfactory.
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PMID:[Study on the determination of metal elements in wild jujube seed decoction by ICP-AES]. 1582 55

An analytical method is presented based on reverse isotope dilution single detector inductively coupled plasma magnetic sector mass spectrometry (ID-ICP-SMS) and applied to the specific case of the certification of a (111)Cd enriched candidate Cd spike calibration material (nominal mass fraction 10 mg kg(-1) in 5% HNO3 solution). Uncertainty propagation was used as a tool for both determining the analytical approach and validating it. The robustness of close to "exact matching" reverse IDMS to correction of measured isotope intensities for multiplicative (mass discrimination) and (semi)additive effects (dead time, instrumental background, and isobaric interference) is discussed. The very low experimental relative standard deviation of the mean (0.08%) of eight replicate determinations indicated that all significant sources of uncertainty had probably been taken into account for the estimation of the final combined uncertainty statement (U(c) = 0.17%, k = 1). IRMM-621 was used as comparator. Uncertainties on IUPAC isotopic abundances of 111Cd and 112Cd, for the natural Cd solution involved between the two enriched materials, formed nearly 60% of U(c). The repeatability of the isotope ratio measurements contributed less than 10%. Correction for procedural blank necessitated somewhat unusual calculations (potential contamination of an enriched material with natural Cd). The procedure also involved a quadrupole based ICP-MS judged to be appropriate for the characterization of the isotopic composition. For comparison purposes, direct IDMS results are simulated using identical experimental input data. Finally, a significant background signal in the 106-116 mass region, observed only with the magnetic sector instrument, was attributed to argon based isobaric interferences.
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PMID:Low uncertainty reverse isotope dilution ICP-MS applied to certifying an isotopically enriched Cd candidate reference material: a case study. 1586 72

A method has been developed enabling direct analysis (i.e. after dilution only) of beer, instant coffee, milk, and milk powder by ICP-AES. Analysis of the beverages after dilution with a low concentration of HNO3 was used for accurate determination of essential minor and trace elements (Ca, Mg, K, P, S, and Zn). Selenium, introduced as the hydride, was determined simultaneously with the other non-hydride-forming elements using the commercial multi-mode sample-introduction system (MSIS). To obtain accurate results, however, some simple pre-treatment was needed. Analysis was also performed after microwave-assisted decomposition of the samples. Three different modes of sample-preparation, i.e. dilution only, partial decomposition (aqua regia treatment), and complete decomposition were compared. The results obtained by use of the three different sample-preparation methods were in very good agreement. Results from analysis of certified reference material (SRM 1459 non-fat milk powder) also verified the accuracy of the methods. The limit of detection obtained for Se using dual-mode sample introduction was 0.5 ng mL(-1), which corresponds to approximately 2 ng g(-1) in beer and approximately 4 ng g(-1) in coffee and milk when using the recommended procedure.
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PMID:Simultaneous determination of hydride (Se) and non-hydride-forming (Ca, Mg, K, P, S and Zn) elements in various beverages (beer, coffee, and milk), with minimum sample preparation, by ICP-AES and use of a dual-mode sample-introduction system. 1590 Apr 68

The adsorption behavior of Cd, Co and Zn on nanometer-size TiQ2 was investigated. At pH 9.0, Cd, Co and Zn were retained on the nanometer-size TiO2, then eluted with 0.1 mol x L(-1) HNO3 and determined by ICP-AES. The adsorption capacities of nanometer TiO2 were found to be 8.1, 6.9 and 15.1 mg x g(-1) for Cd, Co and Zn respectively. The detection limits (3sigma) for Cd, Co and Zn are 5.1, 3.4 and 2.9 ng x mL(-1) respectively. The proposed method has been applied to the determination of trace Cd, Co and Zn in environmental samples with satisfactory results.
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PMID:[Nanometer-size titanium dioxide separation/preconcentration and ICP-AES for the determination of Cd, Co and Zn]. 1601 28

The performance of a mixed binding layer (MBL) for use in diffusive gradients in thin films (DGT) was investigated. The MBL consisted of ferrihydrite and Chelex-100 cation-exchange resin combined together in a binding gel in an attempt to allow measurement of anions and cations in a single assay. Results from the MBL were compared to experiments performed using individual Chelex gels and ferrihydrite gels that have been shown to work successfully for DGT methodology. To facilitate combined analysis of P and cations by ICP-MS, HCl (1 M) was used for gel elution to minimize interferences from 14N16OH or 15N16O on 31P. All elements tested (Cd, Cu, Mn, Mo, P, and Zn) were bound successfully to the MBL. An elution efficiency of 0.92 was obtained for all elements, apart from Mo (0.79). This is higher than the elution efficiencies obtained previously for pure Chelex or ferrihydrite gels using HNO3 (1 M) as the eluent. Uptake of cations by DGT using the MBL was consistent across the pH range 5-9, which compares well with results using pure Chelex. Below pH 5, accumulated masses were lower for Mn, Cu, and Zn. Uptake of P and Mo was unaffected by pH in the range 3-8, and the amount absorbed compared well with results obtained previously for pure ferrihydrite gels. Performance of the MBL at different ionic strengths (0.001, 0.01 M) was comparable to performance using the pure Chelex gel. DGT measurements obtained using the MBL on agricultural soils correlated well (r2 = 0.95) with separate measurements obtained using either pure Chelex or ferrihydrite binding layers. This suggests that the MBL could be used for simultaneous measurement of cationic and anionic element availability in soils.
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PMID:Performance of a mixed binding layer for measuring anions and cations in a single assay using the diffusive gradients in thin films technique. 1619 97


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