摘要
为弥补单藓种监测途径的弊端,克服因藓种分布区局限或不均匀带来的欠缺,本文通过引入多藓种监测和参考苔藓标样技术途径,采用ICP-AES和ICP-MS技术对洪泽湖区域的18种地面藓类植物体内重金属含量进行测定和分析,以研究多藓种监测途径和藓类种间校正方法.同时,测定了欧洲标准藓样M2和M3中的重金属含量,对实验仪器误差进行评估.结果表明,藓类植物中重金属含量差异显著.根据藓类对元素富集能力的不同将藓类分为4类:一般型、富集型、富集/排斥型和排斥型,本研究推荐一般型和富集型藓类应用于江苏省大气重金属沉降监测.对M2和M3中金属含量的推荐值和实测值进行对比,发现M2和M3中金属含量的实测值与推荐值的差异在15%以内,显示本实验采用的ICP-AES和ICP-MS设备精密度良好.根据洪泽湖区细叶小羽藓Haplocladium microphyllum的重金属含量建立了适宜本地重金属监测的种间校准因子,并建议不同地区采用多种藓类监测大气时,应根据当地的苔藓物种建立单独的种间校准方法.
This article introduced a technical approach of multi-moss monitoring combined with the reference moss sample measurement to remedy the disadvantages of single-moss indication method which may have shortcomings due to limited or uneven distribution of the moss species. In order to develop a multiple-moss monitoring pathway and an interspecific calibration of multiple mosses, samples of 18 terrestrial bryophyte species were collected over the territory of Hongze Lake region and the concentrations of several heavy metals in these samples were determined and analyzed by using ICP-AES and ICP-MS techniques. Simultaneously, heavy metal concentrations in the European standard samples M2 and M3 were measured to evaluate the error of the experimental instruments. The results showed that the concentrations of heavy metals in different mosses were significantly different. According to their differential capacity for heavy metal enrichment, mosses could be separated into four categories: general mosses, enrichment mosses, enrichment/exclusion mosses, and exclusion mosses. General and enrichment mosses were recommended to be applied for monitoring the atmospheric heavy metal deposition in Jiangsu Province. Furthermore, the variation between the obtained and recommended concentrations in M2 and M3 was found to be less than 15%, indicating that the precision of ICP-AES and ICP-MS is quite high. Based on the heavy metal concentrations of Haplocladium microphyllum in Hongze Lake region, an interspecific calibration factor suitable for local heavy metal monitoring was established. It was suggested that when using the multiple-moss monitoring approach for air deposition surveys in various areas, specific calibration factors may be set up according to the local bryophyte species.
引文
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