Patterns and levels of PCDD/F in a Chinese graphite electrode sludge |
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Authors: | Ying Xu Qinghua Zhang Wenzhong Wu Wen Li |
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Institution: | (1) State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, 430072 Wuhan, China |
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Abstract: | The graphite electrode sludge was sampled from a huge chloralkali plant in central China. The total level of PCDD/F was found
as high as 378.85 μg/kg sludge (dry weight). The patterns of PCDD/F in each homologue indicated the predominance of tetra-to
octa-chlorinated PCDFs. Furthermore, the toxic 2,3,7,8-substituted PCDFs constituted over 80% of the total PCDFs in the sludge
and the corresponding PCDDs were only at 15 μg/kg level. The calculated value of the international toxic equivalence (I-TEQ)
in sludge was 21.65 μg/kg sludge (dry weight). This typical “dioxin chloralkali pattern” was apparently identified in the
sediments near the effluent outlet of the chloralkali plant. |
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Keywords: | graphite PCDD/F chloralkali contamination |
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