Determination of dissolved silica in waters by a flow-based analysis system composed of a laser diode and a thin long flow-through cell
✍ Scribed by Takashi Korenaga; Fusheng Sun
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 690 KB
- Volume
- 318
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A highly sensitive detection system composed of a laser diode (LD) and a thin long flow-through cell (TLFI'C) for flow-injection analysis (FIA) has been studied. The new detection system was mainly composed of a GaAlAs LD emitting at 780 nm (5 mW> as a light source and a polytetrafluoroethylene rod having a thin long hole (100 X 1.4 mm i.d.) as the light path. The sensitivity was enhanced about 10 times compared with a normal 10 mm flow cell. For the determination of dissolved silica in waters using the molybdenum blue method, the relative standard deviation, detection limit (3~) and linear range were 0.6%, 0.0019 and 0.02-0.3 mg Si I-', respectively. This detection system may also be useful for other flow-based analytical techniques such as liquid chromatography.