摘要
氯甲烷(CH_3Cl)、溴甲烷(CH_3Br)和碘甲烷(CH_3I)是挥发性卤代烃的3种主要成分,对温室效应和大气臭氧破坏有重要影响。由于海藻可以在一定条件下产生卤代烃,本文选择了球形棕囊藻进行室内培养,研究了不同温度、盐度和光照对其释放CH_3Cl、CH_3Br和CH_3I含量的影响。在不同温度(15、20、25℃),盐度(19、23、29)和光照(14、25、38μmol·m^(-2)·s^(-1))条件下,藻细胞密度和卤甲烷的释放受温度的影响较明显。温度偏低(15～20℃)更适宜藻的生长和CH_3I的存在(CH_3I最大平均浓度为5.90～6.29pmol·L^(-1)),但25℃释放的CH_3Cl和CH_3Br最多(最大平均浓度分别为452.48和9.49pmol·L^(-1)),表明CH_3Cl的最大平均浓度比CH_3Br和CH_3I高约10倍。总体上CH_3Cl和CH_3Br的释放随着温度、盐度和光照强度的增加而增大,但盐度和光照的变化对藻的生长和卤甲烷释放的影响不明显。
Methyl chloride （CH 3Cl）, methyl bromide （CH 3Br） and methyl iodide （CH 3I） are major components of volatile halocarbons （VHCs）, which play a significant role in greenhouse effect and atmospheric environment. Marine phytoplankton produce different amounts of CH 3Cl, CH 3Br and CH 3I under varied growth conditions. Emissions of all the methyl halides from Phaeocystis globose were studied under different culture conditions. Specifically, the effects of temperature （15, 20, 25 ℃）, salinity （19, 23, 29） and light intensity （14, 25, 38 μmol·m ^-2 ·s ^-1 ） were examined. Cell population and concentration of methyl halides had no obvious differences under various salinities and light intensities. However, lower temperatures （15-20 ℃） were more suitable for algal growth as well as the emission of CH 3I （The highest concentration were 5.90-6.29 pmol·L ^-1 ）. The highest concentration of CH 3Cl and CH 3Br were 452.48 and 9.49 pmol·L ^-1 respectively under 25 ℃. This indicated the highest concentration of CH 3Cl was 10 times higher than those of CH 3Br and CH 3I. In one word, the concentrations of CH 3Cl and CH 3Br were increased with temperature, salinity and light intensity, while the effects of salinity and light intensity on cell population and the concentration of methyl halides were not obvious.
作者
晏国佳
丁琼瑶
高先池
YAN Guo-Jia;DING Qiong-Yao;GAO Xian-Chi(College of Chemistry and Chemical Engineering,Ocean University of China,Qingdao 266100,China)
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2019年第2期67-73,共7页
Periodical of Ocean University of China
基金
山东省优秀中青年科学家科研奖励基金计划项目(BS2011HZ018)资助~~
关键词
卤代烃
球形棕囊藻
温度
盐度
光照
nethyl halide
Phaeocystis globose
temperature
salinity
light density
