A comparison between the high-temperature catalytic oxidation method (HTCO) and the UV/persulphate method for the determination of dissolved organic carbon (DOC)in seawater is presented in this paper. In seawater samp...A comparison between the high-temperature catalytic oxidation method (HTCO) and the UV/persulphate method for the determination of dissolved organic carbon (DOC)in seawater is presented in this paper. In seawater sample chloride ion can affect the oxidation efficiency of the UV/persulphate method if the asymptotic concentration of persulphate is not reached.During HTCO analysis, blanks that appear to originate mainly from the catalyst are high and far from constant.If the blanks are well estimated and correction is made, the difference of determined DOC values between the UV/persulphatemethod and the HTCO mehod is small, the HTCO values being slightly higher.展开更多
The application of cross flow ultrafiltration(CFF) techniques to separate colloidal organic carbon(COC) from truly dissolved organic carbon(TDOC) was investigated; COC and TDOC were determined by the high temperature ...The application of cross flow ultrafiltration(CFF) techniques to separate colloidal organic carbon(COC) from truly dissolved organic carbon(TDOC) was investigated; COC and TDOC were determined by the high temperature combustion method(HTC) and UV/persulphate method. It was found that CFF can quantitatively separate COC from seawater. The determination results by the HTC and UV/persulphate method for COC and TDOC showed little difference, which suggested that the oxidation efficiency of the two methods are identical. Colloidal particles have no remarkable influence on the oxidation efficiency of the UV/persulphate method.展开更多
文摘A comparison between the high-temperature catalytic oxidation method (HTCO) and the UV/persulphate method for the determination of dissolved organic carbon (DOC)in seawater is presented in this paper. In seawater sample chloride ion can affect the oxidation efficiency of the UV/persulphate method if the asymptotic concentration of persulphate is not reached.During HTCO analysis, blanks that appear to originate mainly from the catalyst are high and far from constant.If the blanks are well estimated and correction is made, the difference of determined DOC values between the UV/persulphatemethod and the HTCO mehod is small, the HTCO values being slightly higher.
文摘The application of cross flow ultrafiltration(CFF) techniques to separate colloidal organic carbon(COC) from truly dissolved organic carbon(TDOC) was investigated; COC and TDOC were determined by the high temperature combustion method(HTC) and UV/persulphate method. It was found that CFF can quantitatively separate COC from seawater. The determination results by the HTC and UV/persulphate method for COC and TDOC showed little difference, which suggested that the oxidation efficiency of the two methods are identical. Colloidal particles have no remarkable influence on the oxidation efficiency of the UV/persulphate method.