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- W2017659502 abstract "Abstract Purging with nitrogen substantially prevented atmospheric carbon dioxide from dissolving in the eluent used in indirect photometric ion chromatography. Total carbonate-carbon at trace levels could be determined as hydrogencarbonate by this method. By using an analytical column (250 × 4.6 mm I.D.) packed with MCI SCA-02 and 5.0 · 10 −4 M sodium hydrogenphthalate—1.5 · 10 −4 M N-2-hydroxyethyl-piperazine-N′-2-ethanesulphonic acid (HEPES) (pH 6.5) as the eluent, hydrogen-carbonate was detected as a negative peak at 250 nm. The detection limit (signal-to-noise ratio = 2) was 1.4 · 10 −11 mol (7 · 10 −7 M with an injection volume of 20 μl) and the calibration graph was linear from 3.0 · 10 −11 to 3.8 · 10 −9 mol ( r = 0.994). The coefficient of variation was less than 2% on injection of 4 · 10 −10 mol. Total carbonate-carbon at levels as low as 10 −4 -10 −6 M level could be determined accurately. The errors in the analysis of practical samples by the method without nitrogen purging are demonstrated." @default.
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- W2017659502 date "1989-01-01" @default.
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- W2017659502 title "Determination of trace levels of total carbonate-carbon by indirect photometric ion chromatography with nitrogen purging" @default.
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- W2017659502 doi "https://doi.org/10.1016/s0021-9673(01)96775-5" @default.
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