Performance of a passive sampler for the determination of time averaged concentrations of nitrate and phosphate in water
Journal article, 2013

A passive sampler device for the kinetic accumulation of nitrate (NO3-) and phosphate (HPO42-) in water was developed and calibrated. The sampler incorporates an ion-exchange disk as the receiving phase and selectively collects nitrate and phosphate at sampling rates of 197 +/- 43 and 75 +/- 12 mL per day, respectively. Minimum exposure times under nutrient rich and nutrient poor conditions were estimated to be 3 and 27 days respectively for phosphate and 1 and 7 days respectively for nitrate. The influence of the environmental variables pH (5-9), temperature (7-21 [degree]C) and turbulence (50-400 rpm) on sampling rates was investigated. Temperature was found to have a significant influence on uptake rates for both anions, while pH influenced phosphate only. Water turbulence did not influence the uptake rates under the studied conditions. A series of field studies was conducted at a municipal wastewater treatment plant. Results for the passive sampler were lower than concentrations obtained using conventional measurement methods, due to methodological differences, and biofouling was found to affect the results for sampling periods over 3 days. This study shows that passive sampling can be used to monitor nitrate and phosphate concentrations in aqueous media. The approach provides an interesting alternative to grab sampling as it yields time-averaged concentrations of the analytes.

Author

Jesper Knutsson

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Sebastien Rauch

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Greg Morrison

Chalmers, Civil and Environmental Engineering, Water Environment Technology

Environmental Sciences: Processes and Impacts

2050-7887 (ISSN) 2050-7895 (eISSN)

5 955-962

Driving Forces

Sustainable development

Subject Categories

Analytical Chemistry

Oceanography, Hydrology, Water Resources

Environmental Sciences

DOI

10.1039/C3EM00038A

More information

Created

10/8/2017