Effects of arsenic (V) and chromium (VI) on the growth and survival of (Azolla microphylla)
Date of Publication
1993
Document Type
Bachelor's Thesis
Degree Name
Bachelor of Science in Biology
College
College of Science
Department/Unit
Biology
Abstract/Summary
The adverse effects of As(V) and Cr(VI) on the growth of water velvet (A. microphylla) was investigated. Test species were grown in nitrogen-free culture media held at pH 5.5 under 12 hour light and 12 hour dark regime. Constant amount of azolla (0.16 g) were placed in white plastic cups and exposed to As (V) and Cr (VI) at concentration levels of 0.0, 1.0, and 10.0 mg/l. Changes in biomass content and frond area were measured and analysed. Test concentrations of 1.0 and 10.0 mg/1 As(V) and Cr(VI) resulted to biomass content reduction lower than the control level 7 percent-59 percent for As(V) and 12 percent-43 percent for Cr(VI). Frond area on the other hand, manifested an overall reduction of 30 percent-65 percent for As(V) and 25 percent-57 percent for Cr(VI). The results of the present study revealed that As(V) and Cr(VI) are phytotoxic to A. microphylla causing growth inhibition under short term laboratory exposure. There was a significant (P 0.05) concentration-dependent reduction in biomass content and frond area of A. microphylla exposed to As (V) and Cr(VI). Time-related effect were found to be insignificant (P 0.05).
Abstract Format
html
Language
English
Format
Accession Number
TU06075
Shelf Location
Archives, The Learning Commons, 12F, Henry Sy Sr. Hall
Physical Description
79 leaves
Keywords
Arsenic--Toxicology; Chromium; Azolla
Recommended Citation
Sarenas, J. A. (1993). Effects of arsenic (V) and chromium (VI) on the growth and survival of (Azolla microphylla). Retrieved from https://animorepository.dlsu.edu.ph/etd_bachelors/1146