激光剥蚀-电感耦合等离子体质谱法原位分析印度芥菜中Cd、P、S、Cu等7种元素
建立了茎中7种元素Cd,P,S,K,Ca,Cu和Zn的LA-ICP-MS原位分析及二维成像方法,并研究了其在镉富集型印度芥菜茎中的分布特征.印度芥菜经50 μmol/L Cd处理14 d后,利用包埋剂包埋,冷冻切片后,用Nd:YAG laser(213 nm)器扫描,激光剥蚀-电感耦合等离子体质谱法(ICP-MS)测定各元素强度,同时选择13C作为内标元素,对各元素强度进行标准化处理.结果表明,在富集型印度芥菜茎部,Cd大量积聚于由韧皮部与木质部组成的维管组织中,除此以外,茎的韧皮部细胞中及表皮层也分布着大量的Cd.7种元素的分布相关性表明,Cd与Ca具有相似的分布规律,而K和Ca,P和S的分...
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          | Published in | 分析化学 Vol. 42; no. 3; pp. 355 - 359 | 
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| Main Author | |
| Format | Journal Article | 
| Language | Chinese | 
| Published | 
            国家地质实验测试中心,北京,100037
    
        2014
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| Subjects | |
| Online Access | Get full text | 
| ISSN | 0253-3820 | 
| DOI | 10.3724/SP.J.1096.2014.31009 | 
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| Summary: | 建立了茎中7种元素Cd,P,S,K,Ca,Cu和Zn的LA-ICP-MS原位分析及二维成像方法,并研究了其在镉富集型印度芥菜茎中的分布特征.印度芥菜经50 μmol/L Cd处理14 d后,利用包埋剂包埋,冷冻切片后,用Nd:YAG laser(213 nm)器扫描,激光剥蚀-电感耦合等离子体质谱法(ICP-MS)测定各元素强度,同时选择13C作为内标元素,对各元素强度进行标准化处理.结果表明,在富集型印度芥菜茎部,Cd大量积聚于由韧皮部与木质部组成的维管组织中,除此以外,茎的韧皮部细胞中及表皮层也分布着大量的Cd.7种元素的分布相关性表明,Cd与Ca具有相似的分布规律,而K和Ca,P和S的分布呈显著正相关.说明重金属元素进入植株体内并被其吸收运输过程是伴随着植物对其它元素的吸收,且具有相似的运输机制.本研究建立的元素原位分析方法证明LA-ICP-MS在植物样品中元素空间分布的研究方面具有很大的潜力. | 
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| Bibliography: | Laser ablation-inductively coupled plasma-mass spectrometry; Indian mustard; In situ analysis;Cadminum; Phosphorus 22-1125/O6 YANG Hong-Xia , ZHAO Ling-Hao, GAO Jin-Xu, LIU Wei, LI Bing ( National Research Center for Geoanalysity, Beijing 100037, China) Imaging of trace metal distribution in the cadmium (Cd) hyperaccumulator Indian mustard by laser ablation inductively coupled plasma-mass spectrometry (LA-ICP-MS) was typically performed using spatial resolutions of 25 txm. Indian Mustard was submitted to 50 mol/L Cd for 14 days exposure and analysed using Nd :YAG laser (213 nm). Intensities of 13C, 34S, 39K, ^44Ca, 66Zn, ^111Cd, 65Cu and 31p were measured by ICP-MS to study elemental distribution. Preferential Cd accumulation in vascular bundles was observed in stem tissue, whereas Cd was mainly localized to the mesophyll and vascular cells. The high relationship between Ca and Cd distribution indicated that the two elements had a very similar pathway. In vivo analytical method developed in this work was useful  | 
| ISSN: | 0253-3820 | 
| DOI: | 10.3724/SP.J.1096.2014.31009 |