Kinetics of chromium and cadmium uptake by three fresh water plants

Date

3-1981

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Carlito R. Barril

Abstract

The rates of uptake of chromium(Cr) and cadmium(Cd) at 2.00, 4.00, 6.00, 8.00, and 10.00 ppm metal ion concentrations of Cr—Cd solutions by Eichornia crassipes, Najas graminea, ,t10. Vallisneria under steady-state conditions were determined. The plants were exposed to the solutions at 1.25, 0.5, 1, 2, 3, 4, and 5 days. Chromium and cadmium in plants were deter—:lined by atomic absorption spectroscopy. Results showed that the uptake of the plants was rapid during the first 24 hours after the exposure, and thereafter absorption slowed down, and in some cases decreased. The rate of uptake can be best described as a mixed—order kinetics with uptake rate constants (ppm/day) ranging from 0.18 to 8.70 for Cr and 0.17 to 1.00 for Cd by E. crassines, 0.18 to 0.55 for Cr and 0.02 to 1.00 for Cd by N. graminea, and 0.29 to 1.50 for Cr and 0.12 to 0.43 for Cd by Vallisneria. Absorption is predominantly by active absorption with a little contribution from passive absorption. Concentration factors of up to 15 for Cr and 163 for Cd by E. cransipes, 45 for Cr mad 267 for Cd by N. gramineap and 73 for Cr and 97 for Cd by Vallisneria.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 1981 C4 J35

Document Type

Thesis

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