Journal
JOURNAL OF CHROMATOGRAPHY A
Volume 883, Issue 1-2, Pages 305-309Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0021-9673(00)00381-2
Keywords
water analysis; methylene blue; sulfide
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A sensitive method involving solid-phase extraction and HPLC analysis of methylene blue has been developed to measure nanomolar levels of dissolved sulfide in oxic surface waters. The procedure included 1) a preconcentration step, in which methylene blue generated from sulfide reaction with n,n-dimethyl-p-phenylenediamine in acidic conditions in the presence of ferric ion was absorbed onto Waters tC(18) cartridge; and 2) a determination step, in which methylene blue was separated by HPLC in a gradient elution to minimize natural organic matter interference and detected by absorbance. The concentrations of the dissolved sulfide, quantified by standard addition, were about 2.1-4.7 nM in oxic surface waters from Galveston Bay, Texas. (C) 2000 Elsevier Science B.V. All rights reserved.
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