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2076115 
Journal Article 
pH-altered interaction of aluminum and fluoride on nutrient uptake, photosynthesis and other variables of Chlorella vulgaris 
Rai, LC; Husaini, Y; Mallick, N 
1998 
Yes 
Aquatic Toxicology
ISSN: 0166-445X
EISSN: 1879-1514 
BIOSIS/98/20794 
AMSTERDAM 
AMSTERDAM 
67-84 
eng 
BIOSIS COPYRIGHT: BIOL ABS. This study presents information on the pH-induced toxicity of AlCl3, AlF3, NaF and AlCl3 + NaF on growth, nutrient uptake, photosynthesis, photosynthetic electron transport, enzymes of nitrogen and phosphorus metabolism and ATPase activity of Chlorella vulgaris. Both PS I and PS II were severely inhibited by the combination of AlCl3 + NaF followed by AlF3, AlCl3 and NaF. Inhibition of acid phosphatase activity was more pronounced than alkaline phosphatase. In general, toxicity of all the test chemicals increased with a downshift in pH. The interaction of AlCl3 and NaF produced additive effect at pH 6.8, and synergistic at pH 6.0 and 4.5. The combination of AlCl3 + NaF did not produce significant difference in the activity of Mg2+ and Ca2+-ATPase in the medium supplemented with 60 and 100 muM PO43- at pH 6.8. Compared to 60 muM PO43-, the test organism grown in 100 muM PO43containing medium depicted significant increase in Mg2+ and Ca2+-ATPase activity at pH 6.0 and 4.5