| Summary: | Study related to Cr (VI) speciation modeling in Code River Yogyakarta
using Visual Minteq to determine Cr(VI) species in Code River of Yogyakarta
and pollutants impact prediction caused by activity of industry in river used
WASP (Water Quality Analysis Simulation Program). In this research, it was
studied the effect of pH on Cr (VI) species that has been formed as well as the
influence of the presence of industry , Kd values , bottom roughness coefficient
and river discharge to Cr (VI) concentration in the Code River . Modelling was
done using the source data from the literature as well as related services.
The result of modeling using Visual MINTEQ indicates Cr (VI) species in
Code River is CrO dominantly
as CrO .The concentration was increased, if the pH of the river was getting
higher. HCrO
give result that the industry would affect the water quality
of Code River. It could be seen through the higher Cr (VI) concentration in the
segmen 1 of the river. The concentration of was directly proportional to
bottom roughness
4
2-
, HCrO4
-
, Cr2O7
2-
and H2CrO4
.
Species Cr(VI)
4
2 -
4
2 -
would be formed, if pH value in the river was in acid condition.
Modeling using WASP
Cr (VI)
the value of Kd and inversely proportional to the value of the .
Cr (VI) concentration in dry season was higher than in rainy season.
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