CAJ | 학술논문

测定海水中的Li、Rb、B、Sr不需要像痕量元素一样采用复杂的分离富集方法,去除基体元素,富集目标元素,而是直接将海水稀释50倍,优化电感耦合等离子体质谱(ICP-MS)参数,提高测试灵敏度后,在线加入内标Re上机测试, Li、Rb、B、Sr的方法检测限(3σ)分别为0.75,0.25,14.0和0.10μg/L。连续测试10次海水样品,计算相对标准偏差(RSD), Li为1.47%, B为3.13%, Rb为2.05%, Sr为2.01%；并进行加标回收率实验,回收率在96.5%~105%之间。结果表明,该操作简单,测定速度快,数据稳定,可靠,满足海水中这4种元素的测试要求。测定了大西洋底层海水(距离海底200 m)中这4种元素,数据偏差小于2.65%,低于方法测试标准偏差,该层位水体稳定,无变化。
측정해수중적Li、Rb、B、Sr불수요상흔량원소일양채용복잡적분리부집방법,거제기체원소,부집목표원소,이시직접장해수희석50배,우화전감우합등리자체질보(ICP-MS)삼수,제고측시령민도후,재선가입내표Re상궤측시, Li、Rb、B、Sr적방법검측한(3σ)분별위0.75,0.25,14.0화0.10μg/L。련속측시10차해수양품,계산상대표준편차(RSD), Li위1.47%, B위3.13%, Rb위2.05%, Sr위2.01%；병진행가표회수솔실험,회수솔재96.5%~105%지간。결과표명,해조작간단,측정속도쾌,수거은정,가고,만족해수중저4충원소적측시요구。측정료대서양저층해수(거리해저200 m)중저4충원소,수거편차소우2.65%,저우방법측시표준편차,해층위수체은정,무변화。
Determination of Li, Rb, B and Sr in seawater does not need to use complicated methods used for deter-mination of trace elements in seawater such as chelation-separation and standard addition calibration. It can be performed briefly by diluting seawater by 50 times directly, tuning the sensitivity of Inductively Coupled Plasma Mass Spectrometry (ICP-MS) and adding internal standard Re on line. The examination limit (3σ) for Li, Rb, B and Sr was 0.75, 0.25, 14.0 and 0.10 μg/L respectively. After 10 times continuous determination of seawater samples, the relative standard deviation (RSD) was calculated:the RSD of Li was 1.47%, B was 3.13%, Rb was 2.05%and Sr was 2.01%. The standard was added to assess the recovery of experimentand the recovery rate was from 96.5%to 105%. The results show that this method is simple, fast, and the data is stable, accurate and reliable, which well met the requirement for determination of these elements in seawater. We have measured these four elements in Atlantic bottom water (from the Underwater at 200 meters). The data deviation was less than 2.65%, which was lower than the standard deviation of the method. The seawater in this layer is steady and there is no change.