CAJ | 학술논문

用吹扫-捕集气相色谱法对北黄海常见的4种挥发性卤代烃(VHC)的研究表明,秋季北黄海表层海水中CHCl3,C2HCl3,CHBr2Cl和CHBr3的浓度和平均值分别为9.9～63.4(14.1±8.1),7.1～29.4(15.4±6.2),0.1～30.3(8.8±10.0)和4.2～56.4(21.6±12.2)pmol/dm3.这4种VHC在水平分布上呈现一定的空间变化,其浓度可能是陆地径流、人为活动和生物产生的影响程度不同造成的.VHC在垂直分布上受到地理位置和水文条件的不同影响,在不同站位有较大差异.周日变化研究表明,VHC具有一定的周日变化特征,受光照和潮汐等因素的共同影响最大值均出现在13:00-16:00.采用Liss和Slater双层模型理论对北黄海表层海水和大气之间CHCl3,C2HCl3和CHBr3的海-气通量进行估算,得到这3种物质在北黄海的海-气通量平均值和范围分别为14.8(0.2～104.4),23.2(1.8～93.0)和15.6(0.7～55.1)nmol/(m2·d).结果表明,在秋季该研究海域是大气CHCl3,C2HCl3和CHBr3的源.
용취소-포집기상색보법대북황해상견적4충휘발성서대경(VHC)적연구표명,추계북황해표층해수중CHCl3,C2HCl3,CHBr2Cl화CHBr3적농도화평균치분별위9.9～63.4(14.1±8.1),7.1～29.4(15.4±6.2),0.1～30.3(8.8±10.0)화4.2～56.4(21.6±12.2)pmol/dm3.저4충VHC재수평분포상정현일정적공간변화,기농도가능시륙지경류、인위활동화생물산생적영향정도불동조성적.VHC재수직분포상수도지리위치화수문조건적불동영향,재불동참위유교대차이.주일변화연구표명,VHC구유일정적주일변화특정,수광조화조석등인소적공동영향최대치균출현재13:00-16:00.채용Liss화Slater쌍층모형이론대북황해표층해수화대기지간CHCl3,C2HCl3화CHBr3적해-기통량진행고산,득도저3충물질재북황해적해-기통량평균치화범위분별위14.8(0.2～104.4),23.2(1.8～93.0)화15.6(0.7～55.1)nmol/(m2·d).결과표명,재추계해연구해역시대기CHCl3,C2HCl3화CHBr3적원.
The concentrations of four kinds of volatile halocarbons (VHCs) in the seawater of the northern Huanghai Sea (NHS) were systematically measured.The results show that the concentrations of CHC13,C2HCl3,CHBr2Cl and CHBr3 in the surface seawater in the NHS are 9.9～ 63.4 (14.1±8.1),7.1～29.4 (15.4±6.2),0.1～30.3 (8.8±10.0) and 4.2～56.4 (21.6±12.2)pmol/dm3,respectively.The concentrations of the 4 VHC in the surface seawater showed a certain degree of spatial variation,which may be subject to different effects of riverine input,human activities and biological produce.The depth and intensity of maxima of the four kinds of VHC concentration in the vertical distributions are different among stations,due to different geographical locations and different effects of hydrological conditions.Therefore,no obvious consistency of the vertical profiles of VHC was observed.The concentrations of four kinds of VHC exhibited a clear diurnal variation in the surface seawater,with the highest concentrations appearing between 13:00 and 16:00,presumably due to co-effect of illumination,tide and other factors at this time.On the basis of gas exchange calculations,the mean sea-to-air fluxes of CHCl3,C2 HCl3 and CHBr3 were estimated to be,respectively,14.8 (0.2～104.4),23.2(1.8～93.0)and 15.6 (0.7～55.1) nmol/(m-2· d),indicating that the study area appears to be a source of atmospheric CHCl3,C2 HCl3 and CHBr3 during the investigated time.