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 ng/kg sludge (dry weight). The patterns of PCDD/F in each homologue indic...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 ng/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 |ig/kg level. The calculated value of the international toxic equivalence (I-TEQ) in sludge was 21.65 (ig/kg sludge (dry weight). This typical 'dioxin chloralkali pattern' was apparently identified in the sediments near the effluent outlet of the chloralkali plant.展开更多
文摘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 ng/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 |ig/kg level. The calculated value of the international toxic equivalence (I-TEQ) in sludge was 21.65 (ig/kg sludge (dry weight). This typical 'dioxin chloralkali pattern' was apparently identified in the sediments near the effluent outlet of the chloralkali plant.
