科研之友
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摘要
It is often difficult to rapidly and affordably measure mercury (Hg) deposition into aquatic environment. We tested the utility of the aquatic submerged macrophyte Potamogeton pectinatus as a bio-indicator of Hg in aquatic environments, both for a background loading perspective and as an indication of enhanced anthropogenic inputs. P. pectinatus were collected from two remote alpine lakes and surrounding areas of Madoi, a town in the Qinghai-Tibet region of China. 79 plant samples of P. pectinatus from 10 different sites were collected and analyzed for total Hg content. The Hg content of P. pectinatus ranged from 15.8 to 317.7 ng g(-1) with the median of 39.9 ng g(-1) which was similar to the reported Hg concentration in submersed plants from the uncontaminated area and represented the unpolluted background value. The mean Hg content was high at two sites near both the town of Madoi and National Highway G214 (128 ng g(-1) and 87 ng g(-1)), slightly low at one site farther from Madoi but near the road (55 ng g(-1)), and relatively low and consistent among the other seven sites (from 26 to 48 ng g(-1)). The Hg contents of P. pectinatus in this area were below the polluted reference value (580 ng g(-1)) and suggested no significant Hg contamination existed in this area. However, the closer of sites were to the roadway, the higher Hg contents were in P. pectinatus along the national highway. Although we can not obtain "clean" water samples from the two lakes due to access and shipping restrictions, we applied a simplistic linear bioconcentration factor to determine that aqueous Hg concentrations may have ranged from 12 to 62 mu gL(-1). This study finds that the typical background value for Hg from this remote region of Qinghai-Tibet is 39.2 ng g(-1) in P. pectinatus, but even here some enhanced deposition from regional cities and proximal roadways is recorded quite clearly in this plant marker of aquatic Hg concentration.
- 出版日期2018
- 单位南宁师范大学
