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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.

已经开发出一种使用半导体激光器 (SCL) 和细长流通池 (TLFCT) 的高灵敏度检测系统，以匹配流动注射分析 (FIA) 等基于流动的分析。 SCL是GaAIA半导体激光器，发射波长为780 nm（5mW），TLFTC具有100 mm细长光路，由聚四氟乙烯（PTFE）棒制成。与使用 10 mm 传统流通池的普通 FIA 分光光度法相比，灵敏度本质上提高了约 10 倍。该检测系统应用于钼蓝分光光度法测定水中总磷（P）时，相对标准偏差、检出限和线性范围分别为1.0%（n=10 at 20 μg P 1^<-1>）、0.6（3sigma）和1.0-50 μg P 1^<-1>，样品结果与官方方法相当一致。还可以将本检测系统应用于其他基于流动的分析方法，例如液相色谱系列。水中溶解的二氧化硅的测定是检测系统在实际痕量分析中的应用之一。样品中的其他痕量成分也可以通过 FLA 使用该检测系统进行测量。 SCL的技术正在迅速进步。输出功率每年翻一番，成本却降低一半。 TLFTC的光程可以进一步延长，以进一步提高灵敏度。当一种频率连续可调、价格低廉的SCL问世后，使用这种分析技术来测定样品中的多种痕量成分将变得更加合适和方便。新的检测系统也可能有利于其他基于流动的分析技术，例如液相色谱法。