Particulate heavy metal transport in the lower Paraiba do Sul River basin,southeastern, Brazil

In the present study an attempt has been made to calculate the mass transfe rs of suspended particulate matter and associated heavy metal within the lo wer portion of the Paraiba do Sul River drainage basin and the contribution of its tributaries. The highest metal loads were related with the highest water flows and, consequently, with the highest suspended particulate matte r loads, which increased both by surface runoff and sediment resuspension. The highest flow month for the total transported load contributed between 3 4 and 66% of the total metal transported per year. Tnt total load transport ed during the entire rainy season ranges from 82 to 93% of the total transp orted load. The importance of the tributary input for the total transported load of the Paraiba do Sul River was generally lower than 10%, although in some months, when the Paraiba do Sul River had low water discharge and sto rage local rain occurred, this increased upto 40%. Copyright (C) 2001 John Wiley & Sons, Ltd.