九龙江口及厦门邻近海域溶解226Ra、228Ra的行为

学位：理学硕士院系专业：海洋与环境学院海洋学系_海洋化学学号：YL00014

Simultaneous Concentration and Determination of ￣(226)Ra,￣(228)Ra in Natural Waters

采用ＭｎＯ＿２－纤维富集法同时富集天然水中的￣（２２６）Ｒａ、￣（２２８）Ｒａ，接着用ＭｎＯ＿２－纤维直接射气法测定￣（２２２）Ｒｎ及其子体α放射性的方法测定￣（２２６）Ｒａ，对￣（２２８）Ｒａ则通过测定第一代子体￣（２２８）Ａｃ的β放射性的方法加以确定。通过对河水、海水、地下水、井水等各种水样的实际验证，表明该测定程序具有灵敏、准确可靠、简便、易于掌握等优点，适用于天然水体中低含量￣（２２６）Ｒａ、￣（２２８）Ｒａ的测定。 【英文摘要】 ?226)Ra,￣(228)Ra in natural waters are concentrated by MnO_2-fiber,then both isotopesare determined through emanation of MnO_2-fiber which adsorbed Ra isotopes and βcounting for￣(228)Ac,daughter of ￣(228)Ra, respectively, Examination with various waters such as river-water, sea -water,ground -water and well-water etc.,it is showed that this method is sensitive,reliable,simple and easyto operate. The methods are feasible for measurement of low level￣(226)Ra,￣(228) Ra in natural waters.国家教委博士学科点专项科研基金和厦门市海洋管理处海洋研究开发基

A New Method for Rapid Concentration and Determination of ~(224) Ra in Seawater

报道一种快速富集、测定海水中 2 2 4 Ra的新方法 .该法用 Mn O2 -纤维富集 60升海水中 2 2 4 Ra,用 2 2 0 Rn的连续射气闪烁计数法测 2 2 4 Ra的比活度 ,方法简便、快速、灵敏、准确 ,适合于船上等现场操作 ,已成功地应用于九龙江河口区和厦门湾水体中 2 2 4 Ra的分布与地球化学行为的研究 【英文摘要】 A new method for rapid concentration and determination of 224 Ra in seawater was presented. 224 Ra was preconcentrated from seawater by adsorpting onto MnO 2 fiber. The specific activity of 224 Ra adsorpted on the fiber was determined by stripping its daughter, 220 Rn, directly from the fiber bundle by circulating a stream of N 2 through it and measuring the 220 Rn activity concurrenty. This method is simple,sensitive,accurate and suitable for field operations. It was successful...国家自然科学基金!( 4 0 0 760 2 4 );; 福建省自然科学基金!(D960 0 1)资助项

Distribution of (224)~Ra in the Jiulong Estuarine waters and its application

研究了九龙江河口区表层水体中２２４Ｒａ的分布，发现同世界其他河口一样，２２４Ｒａ在九龙江河口区呈非保守行为；同时发现２２４Ｒａ－Ｓｓ关系受季节变化的影响显著；与世界其他河口相比，九龙江河口表层水体中２２４Ｒａ含量偏高；用九龙江河口区海端溶解态２２４Ｒａ估算九龙江河口水流向外海的流速在夏季为２．５ｃｍ／ｓ，冬季为０．９１ｃｍ／ｓ． 【英文摘要】 The distribution of 224_Ra in the Jiulong estuarine waters has been investigated. The results show that 224_Ra non-conservative in this estuary, just as the other estuaries of the world. Variation of 224_Ra activities with salinities is examined and 224_Ra-S relationship is affected obviously by the seasons. The maxima iof dissolved 224_Ra in the Jiulong estuarine waters is (37.7±1.6) Bq/m3 (S=15.57) duringspring and (37.7±0.2) Bq/m3 (S=18.68) during winter. Based on dissolved 224_Ra data, the current...福建省自然科学基金!D96001;;高等学校博士学科点专项科研基金!953840

Profiles of ~(224)Ra in the Xiamen Bay waters and its application

本文采用MnO2-纤维富集、220Rn的连续射气闪烁法测定厦门湾海水中的224Ra，利用其垂直分布求出该海域的垂直涡动扩散系数（Kz），为该海域可溶性污染物扩散、迁移和海域自净能力的估算提供理论依据．该海域224Ra的垂直分布及由此得出的Kz使我们能够洞悉研究海域水体的垂直扩散特征及其时、空变化． 【英文摘要】 ──The activity of 224Ra in the seawater from the Xiamen Bay was determined by preconcentration with MnO2-fiber and successive emanation scintillation method of 220Rn. The profiles of 224Ra were applied to the estimation of the vertical eddy diffusion coefficient (Kz) at the several stations in the Xiamen Bay. The Profiles of 224Ra and Kz arising there from make it possible to gain an insight into the pattern of the vertical diffusion of the waters in sea area studied and its spatial and temporal variations....福建省自然科学基金!D96001;;高等学校博士学科点专项科研基

Simultaneous Determination of Trace Elements in Human Hairby Inductively Coupled Plasma Massspectrometry (ICPMS)

建立了微波消化、等离子体质谱同时测定人发样品中20种元素含量的方法，对影响测定结果的因素进行了讨论和优化，所测元素的检出限（3σ，n＝11）最高为1.39ng/Ml（SE），最低为0.0001ng/Ml（bA），标准加入回收率介于95%~110%之间，对国家标准物质样品分析的结果与所给参考值一致.本方法具有灵敏度高，基体干扰小，简便快速，结果可靠等优点，已成功地应用人发样品中微量元素的测定.Contents of twenty elements in human hair were measured with microwave digestion and inductively coupled plasma massspectrometry (ICPMS).The experimental conditions were discussed and optimized.Detection limits(3σ,n=11) results indicated that the highest DL was 1.39 ng/mL(Se) and the lowest was 0.000 1 ng/mL (Ba).The recoveries of spikes For 20 elements were between 94%--110%.The analytical results of national certiFied reFerence material demonstrated the applicabilityof the proposed method

Group Analysis of Lubricating-Oil

本文研究了润滑油(基础油)的族组分分析方法,先用柱色谱法将样品预分离为饱和烃、芳烃、非烃等三部分,通过薄层色谱法和气相色谱法检验其分离效果,最后用质谱进一步测定,得到链烷烃、一环芳烃、二环芳烃及多环芳烃等的族组分含量。The paper reports a group analysis of the lubricating-oil by using column chromatography and mass spectro metry

~(226)Ra and ~(228)Ra in Jiulong estuarine area

用MnO2－纤维富集大体积水样中的Ra同位素，并用直接射气法测定（226）Ra和（228）Ac的（226）β计数法测定（228）Ra的方法，研究了九龙江河口区（226）Ra、（228）Ra的行为，结果表明：在该河口区（226）Ra、（226）Ra均呈非保守行为，（226）Ra、（228）Ra的最高值分别在盐度为19和9处测得。（228）Ra／（226）Ra）A.R。值在盐度小于19的区域约为3左右。与世界其他河口区相比，九龙江河口区的（226）Ra、（228）Ra有两个特征：其一是（226）Ra、（228）Ra的最大值较高；其二是（228）Ra／（226）A.R。值高于世界平均水平，本文对此进行了分析与讨论。 【英文摘要】 Behaviors of 226Ra, 228Ra in the Jiulong estuary were studied by using MnO2 fiber to concentrated Ra from large volume water samples, Both isotopes were analyzed by emanation of MnO2-fiber which adsorbed Ra isotopes, and βcounting 228Ac, daughter of 228Ra, respective-ly. Results showed that in this area, both 226Ra and 228Ra performed non-conserved behaviors and the maximum value of 226Ra and 228Ra were detected at stations with S = 19 and S= 9, respectlvely. 228Ra/226Ra )A.R. was near 3 in the area with an...国家教委博士学科点专项科研基金;;厦门市海洋管理处海洋研究开发基

流动注射氢化物发生原子荧光法测定中药中的微量As、Hg

建立了一套流动注射－氢化物发生－原子荧光测定中药样品中微量Ａｓ、Ｈｇ的方法，研究了酸度、ＮａＢＨ４浓度、载气流速等条件对检出限的影响．在优化的工作条件下，对砷、汞的检出限分别为０．１ｎｇ／ｍＬ和０．０２ｎｇ／ｍＬ．本法具有操作简便、快速，灵敏度高等优点，可用于中药样品中微量Ａｓ、Ｈｇ的测定

-(226)Ra and -(228)Ra in Jiulong estuarine area

用MnO2-纤维富集大体积水样中的rA同位素，并用直接射气法测定（226）rA和（228）AC的（226）β计数法测定（228）rA的方法，研究了九龙江河口区（226）rA、（228）rA的行为，结果表明：在该河口区（226）rA、（226）rA均呈非保守行为，（226）rA、（228）rA的最高值分别在盐度为19和9处测得。（228）rA/（226）rA）A.r。值在盐度小于19的区域约为3左右。与世界其他河口区相比，九龙江河口区的（226）rA、（228）rA有两个特征：其一是（226）rA、（228）rA的最大值较高；其二是（228）rA/（226）A.r。值高于世界平均水平，本文对此进行了分析与讨论。Behaviors of 226Ra, 228Ra in the Jiulong estuary were studied by using MnO2 Fiber to concentrated Ra From large volume water samples, Both isotopes were analyzed by emanation of MnO2-Fiber which adsorbed Ra isotopes, and βcounting 228Ac, daughter of 228Ra, respective-ly.Results showed that in this area, both 226Ra and 228Ra perFormed non-conserved behaviors and the maximum value of 226Ra and 228Ra were detected at stations with S = 19 and S= 9, respectlvely.228Ra/226Ra )A.R.was near 3 in the area with an S less than 19.Compared with other estuaries, there are two characteristics in the Jiulong estuary, one is the larger maximum of 226Ra,228Ra, and the other is higher 228Ra/226Ra )A.R.The causes of these results are under study国家教委博士学科点专项科研基金;厦门市海洋管理处海洋研究开发基