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Flow Injection Spectrophotometric Method for the Quantitative Determination of Humic Acid (HA) in Treated and Natural Waters

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dc.contributor.author TAHSEEN GHOUS
dc.contributor.author AAMIR RASHEED
dc.contributor.author MUHAMMAD SIRAJ
dc.date.accessioned 2023-11-30T04:41:25Z
dc.date.available 2023-11-30T04:41:25Z
dc.date.issued 2010-06-08
dc.identifier.citation Ghous, T., Rasheed, A., & Siraj, M. (2010). Flow injection spectrophotometric method for the quantitative determination of humic acid (HA) in treated and natural waters. J. Chem. Soc. Pak, 32, 313-318. en_US
dc.identifier.issn 0253-5106
dc.identifier.uri http://142.54.178.187:9060/xmlui/handle/123456789/19981
dc.description.abstract A double channel flow injection (FI) spectrophotometric method was established for humic acid (HA) determination in milligram levels in treated and natural waters. FI method was developed for the determination of humic acid by injecting 100 µL of humic acid into a carrier stream of sodium citrate phosphate buffer (0.05 M, pH 7.0) followed by the injection of 50 µL toluidine blue (TB) solution. Both reagents were allowed to mix at T-junction and passed through a 25 cm reaction coil tubing before passing through the flow through cell (10 mm light path, 30 µL volume). Change in absorbance was measured at 630 nm. The method was calibrated with standard solutions of HA from 0.5-60 mgL⁻¹.The calibration curve showed two linearity trends one ranging 0.5-20 mgL⁻¹ and the other ranging 20-50 mgL⁻¹. The detection limit was 0.5 mgL⁻¹ of HA, and relative standard deviation (rsd) of 5 replicate measurements was 0.294%.The developed method was successfully applied for the HA determination in water samples from drinking water plants, rivers, lakes and streams. The sampling rate was more than 80 samples h⁻¹. The method proves to be simple, rapid, feasible and reproducible. en_US
dc.description.sponsorship The chemical society of Pakistan is an approved society from the PSF. en_US
dc.language.iso en en_US
dc.publisher HEJ Research Institute of Chemistry, University of Karachi, Karachi. en_US
dc.title Flow Injection Spectrophotometric Method for the Quantitative Determination of Humic Acid (HA) in Treated and Natural Waters en_US
dc.type Article en_US


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