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Development of Photometric Flow Analyzer with Laser Diode and Long Flow Cell

激光二极管和长流通池光度流量分析仪的研制

基本信息

批准号：
07650982
负责人：
KORENAGA Takashi
金额：
$ 1.41万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650982/
关键词：
semiconductor laser laser diode laser spectroscopy long flow cell phosphorus silica trace analysis high sensitivity マイクロポンプ分子化学工学分子拡散

项目摘要

A highly sensitive detection system using a semiconductor laser (SCL) and a thin long flow-through cell (TLFCT) to match flow-based analysis, such as flow injection analysis (FIA), has been developed. The SCL was a GaAIAs semiconductor laser emitting at 780 nm (5mW), and the TLFTC,which has a 100 mm thin long light path, was made of a poly (tetrafluoroethylene) (PTFE) rod. The sensitivity was essentially improved about 10-fold in comparison to usual FIA-spectrophotometry using a 10 mm conventional flow cell. When this detection system was applied to the determination of total phosphorus (P) in water by molybdenum-blue spectrophotometry, the relative standard deviation, detection limit and linear range were 1.0% (n=10 at 20 mug P 1^<-1>), 0.6 (3sigma) and 1.0-50 mug P 1^<-1>, respectively, and the results for the samples were fairly consistent with those by the official method. It may also be possible to apply the present detection system to other flow-based analytical methods such as the liquid chromatography family.The determination of dissolved silica in waters is one of the applications of the detection system to practical trace analysis. Other trace components in samples could also be measured by FLA with this detection system. The technology of the SCL is progressing rapidly. The output power doubles every year, and the cost is cut in half. The light pathlength of TLFTC may be further prolonged for further increasing the sensitivity. When an inexpensive SCL,which can be continuously adjustable in frequency, comes available, it will be ever more suitable and convenient for determinations of many trace components in samples to use this analytical technique. The new detection system may also be beneficial to other flow-based analytical techniques such as liquid chromatography.

开发了一种高灵敏度的检测系统，该系统使用半导体激光器（SCL）和薄长流通池（TLFCT）来匹配基于流动的分析，例如流动注射分析（FIA）。SCL是在780 nm（5 mW）下发射的GaAlAs半导体激光器，并且具有100 mm薄长光路的TLFTC由聚（PTFE）棒制成。与使用10 mm常规流动池的通常FIA-分光光度法相比，灵敏度基本上提高了约10倍。将该体系用于水中总磷的测定，相对标准偏差为1.0%（n=10，20 μ g/L），检出限<-1>为0.6（3sigma），线性范围为1.0 ~ 50 μ g/L<-1>，测定结果与标准方法一致。也可以将本发明的检测系统应用于其它基于流动的分析方法，例如液相色谱系列。测定沃茨的溶解二氧化硅是检测系统在实际痕量分析中的应用之一。该检测系统还可用于样品中其它痕量组分的检测。SCL的技术正在迅速发展。输出功率每年翻一番，成本降低一半。TLFTC的光程长度可以进一步延长，以进一步提高灵敏度。当一种价格低廉、频率连续可调的SCL出现时，它将更适合和方便地用于样品中多种痕量组分的测定。新的检测系统也可能有益于其他基于流动的分析技术，如液相色谱。