carbazide), in aqueous, sediment and soil samples is reported. Different leaching
reagents like 0.5M NaOH-0.28M Na2CO3 and 0.2 M H3PO4 were used for the
isolation of Cr+6 from sediment and soil samples. Determination of Cr6 by using
0.5M NaOH-0.28M Na2CO3 as leaching reagent followed by spectrophotometric
measurements provided satisfied results. The optimum experimental parameters
of the reactions have been studied and the validity of the described procedures
was assessed. Statistical analysis of the results has been carried out revealing
high accuracy and good precision. Total Cr concentration was analyzed by
AASF technique. This paper explores the development and application of Cr6
chemical speciation in a polluted area and marine environment. The polluted site
of Porto Romano, Durres, pointed as “Hot Spot Pollution” from UNEP/MAP
(1992) was under investigation. The content of Cr+6 in soil and surface water
samples inside territory of polluted site is very high (some g/kg in soil samples
and arrived up to 130 mg/l in surface water samples). More than 90% of Crtot
belongs to its easy soluble form and only 2−10% of it belongs to the
form bounded with soils. The content of Cr+6 in seawater (about 0.04 mg/l) and
sediment (5-6 mg/kg as Crtot) samples resulted within the normal levels. Only 11
to 13% of Crtot belongs to its easy soluble form and most of it (87−89%)
belongs to the form bounded with sediments.