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Citation: XIE Fa-Zhi, HU Ting-Ting, FU Hao-Han, LUO Xuan, WANG Xian-Biao, SHENG Dan-Dan, LI Hai-Bin, WANG Xue-Chun, XIE Zhi-Yong. Basic Magnesium Carbonate-Based Diffusive Gradients in Thin Films Technique for in situ Measurement of Dissolved Phosphorus in Eutrophic Waters[J]. Chinese Journal of Analytical Chemistry, ;2016, 44(6): 965-969. doi: 10.11895/j.issn.0253-3820.150839 shu

Basic Magnesium Carbonate-Based Diffusive Gradients in Thin Films Technique for in situ Measurement of Dissolved Phosphorus in Eutrophic Waters

School of Materials Science and Chemical Engineering, Anhui Jianzhu University, Hefei 230022, China

Received Date: 22 October 2015
Revised Date: 4 January 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (Nos. 21107001, 21371005) and the Natural Science Foundation of Anhui Province, China (No. 1608085MB43)

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A technique of diffusive gradients in thin films (DGT) was developed for the in situ measurement of reactive phosphorus species in natural waters, sediments and potentially soils. Polyacrylamide/basic magnesium carbonate was used as the novel binding phase of DGT. Various factors, such as initial concentration, deployment time, pH and ionic strength, which may affect the adsorption of phosphate to the DGT were investigated. H₂SO₄ (0.25 mol/L, 10 mL) was used for elution of phosphate from the binding gel, and an elution efficiency of 85±5% was obtained. The DGT measurement was independent of ionic strength (0.001-0.05 mol/L) and pH (4.10-9.15). The results indicated that the maximum adsorption capacities of DGT were limited to 20.4 μg per disc (T=25℃, pH=7.00, [P]=2 mg/L). Good agreement was obtained between the measurement results of DGT method and molybdenum blue method in the P concentration from 0.001 to 20 mg/L. The method detection limit (MDL) was 102.4 ng/L. Field performances of DGT in synthetic seawater, the coastal seawater of Xiamen, Lake Yihai, Lake Chaohu and Nanfei River indicated that the basic magnesium carbonate-DGT method was more reliable than the commonly used ferrihydrite-DGT method."
- Diffusive gradients in thin films technique,
- Basic magnesium carbonate,
- Phosphorus,
- Eutrophication
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