Reply to comment by Chin-Chang Hung et al on 'How accurate are Th-234 measurements in seawater based on the MnO2-impregnated cartridge technique?‘‘

We disagree that the comparison of the small-volume MnO2coprecipitation method and the MnO2，cartridge method of Hung et al.[2008] is adequate. This is because at least some of the small-volume234Th data used for their compar-ison relied on an early protocol of the small- volume method that did not i...

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Bibliographic Details
Main Authors: Cai, PH, Dai, MH, Lv, DW, Chen, WF
Format: Article in Journal/Newspaper
Language:English
Published: 2008
Subjects:
PARTICULATE ORGANIC-CARBON
GULF-OF-MEXICO
SMALL-VOLUME TECHNIQUE
UPPER OCEAN EXPORT
THORIUM ISOTOPES
SEASONAL-CHANGES
SEDIMENT TRAPS
ARCTIC-OCEAN
POC EXPORT
FLUX
Arctic
Arctic Ocean
Online Access:http://dspace.xmu.edu.cn/handle/2288/60240
Description
Summary:We disagree that the comparison of the small-volume MnO2coprecipitation method and the MnO2，cartridge method of Hung et al.[2008] is adequate. This is because at least some of the small-volume234Th data used for their compar-ison relied on an early protocol of the small- volume method that did not include a recovery correction. Thus results are potentially biased. New data from the South China Sea onfirmour earlier conclusion that the extraction efficiency for 234，Th is substantially overestimated by the cartridge method. We therefore restate that the small-volume234，Thmethod that includes a recovery correction is advantageous over the cartridge tech-nique and is recommended to more acurately quantify234，Th activities used to constrain the export of particulate organic carbon in the upper ocean.

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