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- W1968621567 abstract "The determination of B in small volumes of undigested blood plasma and urine by isotope dilution and high efficiency direct injection nebulization (DIN) inductively coupled plasma mass spectrometry (ICP-MS) is proposed. The C interference over 11B was removed by precipitating the samples proteins. Samples aliquots of 1 ml were spiked with an enriched 10B solution and shaken during 1 h to attain the isotopic equilibrium. Thereafter, the sample proteins were denaturated with nitric acid and the supernatant was analyzed. This procedure was effective to reduce C concentrations in approximately 94%. Sample volumes of 50 μl were introduced into the ICP by the direct injection nebulizer producing transient signals lasting 30 s for B isotopes measurements. Precision of 10B/11B measurements was characterized by relative standard deviation (RSD) lower than 1%. The instrumental mass discrimination factor was lower than 5%. Total B concentrations from 100 to 135 μg L−1 in plasma and 0.499 to 3.021 mg L−1 in urine samples were found. Reproducibility of triplicate samples was characterized by RSD<2.0% for plasma and lower than 1.3% for urine samples. Limit of detection (3σ) of 0.6 ng ml−1 was calculated from synthetic blood plasma blank. Results of the denatured supernatant and digested plasma and urine samples were comparable at the 95% confidence level." @default.
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- W1968621567 date "2004-08-01" @default.
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- W1968621567 title "Determination of B in body fluids by isotope dilution inductively coupled mass spectrometry with direct injection nebulization" @default.
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- W1968621567 doi "https://doi.org/10.1016/j.microc.2004.02.005" @default.
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