DIRECT DETERMINATION OF ALUMINUM IN DRINKING AND NATURAL WATERS AS 8-HYDROXYQUINOLINE CHELATE BY RP-HPLC

2001 ◽  
Vol 24 (2) ◽  
pp. 215-228 ◽  
Author(s):  
Hong-Zhen Lian ◽  
Shu-Ping Bi ◽  
Yi-Jun Chen ◽  
Lei-Mei Dai ◽  
Mi Cao ◽  
...  
Keyword(s):  
Natural Waters ◽  
Direct Determination ◽  
Rp Hplc

Direct Spectrophotometric Analysis of Cr(VI) Using a Liquid Waveguide Capillary Cell

2008 ◽  
Vol 62 (1) ◽  
pp. 107-115 ◽  
Author(s):  
Tatiana G. Levitskaia ◽  
Matthew J. O'Hara ◽  
Sergei I. Sinkov ◽  
Oleg B. Egorov
Keyword(s):  
Ground Water ◽  
Water Samples ◽  
Natural Waters ◽  
Direct Determination ◽  
Concentration Data ◽  
Actual Surface ◽  
Optical Absorbance ◽  
Vis Spectroscopy ◽  
Liquid Waveguide Capillary Cell

Hexavalent chromium Cr(VI) is a notorious ground water contaminant toxic to humans and animals. Assessment of an exposure risk for aquatic receptors necessitates frequent Cr(VI) concentration data from a range of surface and groundwater locations at Cr(VI) contamination sites. In this work, we demonstrate that enhanced ultraviolet–visible (UV-vis) spectroscopy using a liquid waveguide capillary cell (LWCC) offers an easy-to-use and economical methodology for the determination of chromate anion CrO42− in Hanford natural waters without chemical pretreatment and generation of hazardous waste. Direct determination of CrO42− in actual surface and ground water samples with the complexities of competing ions, dissolved organics, and other potential interfering agents was achieved by measuring the chromate optical absorbance at 372 nm. For a 100 cm path length LWCC, the detection limit for chromate was found to be as low as 0.073 ppb. A quantitative relationship between the intensity of the absorbance signal and water pH allowed for the straightforward calculation of total Cr(VI) content in natural water. The described method is applicable for in-field monitoring of Cr(VI) in environmental water samples at trace levels.

Development of a low cost microfluidic sensor for the direct determination of nitrate using chromotropic acid in natural waters

2015 ◽  
Vol 7 (13) ◽  
pp. 5396-5405 ◽  
Author(s):  
Deirdre Cogan ◽  
Cormac Fay ◽  
David Boyle ◽  
Conor Osborne ◽  
Nigel Kent ◽  
...  
Keyword(s):  
Natural Waters ◽  
Simple Procedure ◽  
Low Cost ◽  
Direct Determination ◽  
Chromotropic Acid ◽  
First Time

This study has demonstrated, for the first time, a microfluidic autonomous analyser for the direct determination of nitrate, incorporating a modified version of the chromotropic method resulting in a direct, quick, inexpensive and simple procedure to measure nitrate in situ.

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