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Derbendikhan reservoir is located on the south east of Sulaimani province between longitude 35° 6' 35"N and latitude, 45° 41' 20" E, and it is the second largest reservoir in the Iraqi Kurdistan region at an altitude of about 485 m above sea level. More than twenty genera of fishes are endemic to this reservoir, Silurus triostegus is one of them, which was selected to determine the amount of heavy metals that accumulated in the muscle tissue. The results revealed that the metals were accumulated in the following descending order (Fe

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A spectrophotometric method for the determination of trace amounts of indole in aqueous solution is described. The method is based on the coupling reaction of the determinand with diazotised sulphanilic acid to form, in an acidic medium, an intense yellow, water-soluble, stable azo dye, which shows maximum absorption at 445 nm. The graph of absorbance versus concentration in linear, indicating that Beer's law is obeyed over the range 30-90 pg of indole in a final volume of 25 ml, i.e., 1.2-3.6 p.p.m., with a molar absorptivity of 33.4 x lo3 I mol-1 cm-1, a sensitivity index of 0.0035 pg cm-2, a relative error of 0 to -1.6% and a relative standard deviation of 0.2-1.9%, depending on the determinand concentration. The optimum reaction conditions and interferences from foreign organic compounds have been investigated.

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