ResumoTestes buscando avaliar a toxicidade do sulfato de cobre ao mexilhão dourado (Limnoperna fortunei) foram realizados em laboratório, com o objetivo de se encontrar a dose letal (CE 50 e CE 95 48 h) para o controle do molusco. Avaliaram-se também os níveis de resíduos de cobre nas águas testadas, nas conchas e tecidos dos moluscos, empregando espectrofotometria de absorção atômica de chama, (LD 0,0012 mg L -1 para cobre). Amostras de água e de exemplares de mexilhão dourado foram coletados no Lago Guaíba na cidade de
Three different types of physical substrata such as sand, granualar activated carbon (GAC) and plastic macaroni beads were selected to identify a suitable solid carrier as a course matrix for the permeable reactive barrier (PRB) in a sand filled two-dimensional laboratory-scale model aquifer. An adhesion experiment was performed and tested with Pseudomonas sp ADP (PASP) under agitated as well as static conditions. In static conditions, adhesion to GAC was the highest (80%) followed by that to beads (60%). No adhesion to sand was observed under static or agitated conditions. Since atrazine is adsorbed by GAC, its bioavailability for degradation by PADP may be affected. To test this, simultaneous loss of atrazine and release of chloride (dechlorination, the first step in the pathway of atrazine degradation by PADP) were determined in the presence and absence of GAC. Although cells remained viable, no significant chloride release was detected. Thus, plastic macaroni beads were identified and selected as the most suitable support for PADP in the biological permeable reactive barrier (BPRB) of the model aquifer.Key words: Suitable Solid; Laboratory Scale; PADPTribhuvan University JournalVol. XXV, No. 1, 2005Page:119-128Uploaded date: 26, September, 2010
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