Biology Department, Faculty of Science, University of Ottawa, P.O. Box 450, Stn. A., Ottawa, ON, Canada.
Sci Total Environ. 2010 Apr 1;408(9):2087-95. doi: 10.1016/j.scitotenv.2009.12.037. Epub 2010 Feb 6.
Total mercury (THg), methyl mercury (MeHg), total organic carbon (TOC), sediment bulk density (SBD), redox potential (Eh) and percent fines measurements were made on sediment cores collected along transects from littoral to profundal depths in Harp, Dickie, and Blue Chalk lake located on the Canadian Shield near Dorset, Ontario, Canada to determine whether empirical relationships exist among these sediment properties. MeHg was positively correlated with THg in all sediments with a MeHg:THg ratio (0.004+/-0.004) comparable to other uncontaminated profundal lakes. MeHg, MeHg:THg and TOC decreased with sediment depth within the core for all lakes, whereas THg only showed a decrease in Harp Lake. MeHg:THg ratio in surficial sediments was positively correlated with Eh and negatively correlated with TOC [MeHg:THg=-0.009 TOC (%)+0.001 Eh (mV)-1.902, p=0.026]; whereas THg was positively correlated with TOC [log THg (ppb)=0.026 TOC (%)+1.400, p<0.0001].
总汞 (THg)、甲基汞 (MeHg)、总有机碳 (TOC)、沉积物体密度 (SBD)、氧化还原电位 (Eh) 和细颗粒百分比的测量是在加拿大安大略省多赛特附近的加拿大盾上的 Harp、Dickie 和 Blue Chalk 湖中从潮间带到深水区采集的沉积物岩芯中进行的，以确定这些沉积物特性之间是否存在经验关系。在所有沉积物中，MeHg 与 THg 呈正相关，MeHg:THg 比值 (0.004+/-0.004) 与其他无污染深湖相当。在所有湖泊中，MeHg、MeHg:THg 和 TOC 随沉积物深度的增加而减少，而只有 Harp 湖的 THg 减少。表层沉积物中 MeHg:THg 比值与 Eh 呈正相关，与 TOC 呈负相关[MeHg:THg=-0.009 TOC (%)+0.001 Eh (mV)-1.902，p=0.026]；而 THg 与 TOC 呈正相关[log THg (ppb)=0.026 TOC (%)+1.400，p<0.0001]。
