Experimental Studies on the Potential of Two Terrestrial Mosses in Monitoring Water Contaminated by Cd and Cr

摘要

The terrestrial mosses Hypnwn hamulosum and Brachythecium brotheri, which could live in water under experimental conditions, were treated with Cd2~+ at 0, 20, 50, 100, 150, and 200 mg·L~(-1), and C~(-3) at 0, 10, 20, 30, 50, and 100 mg·L~(-1). The Cd~(2+) and Cr~(3+) contents in H. hamulosum and B. brotheri were measured by ICP-AES after they had been submerged in the treatment solution for 7, 14, 21, and 28 days. The results showed: (1) Both moss species have a high ability in absorb Cd and Cr. (2) With the increase of Cd~(2+)' (or Cr3~+) concentration in the culture solution, the Cd (or Cr) contents both in H. hamulosum and B. brotheri increased linearly (3) With the extension of the treatment time, their Cd and Cr content increased logarithmically. (4) Hyphnum hamulosum and B. brotheri differ in their ability to absorb Cd~(2+) and Cr~(3+); the former has a higher ability to absorb Cd~(2+), but lower ability to absorb Cr~(3+) than the latter.