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Citation: LIN Kun-Ning, MA Jian, YUAN Dong-Xing, HUANG Yong-Ming, FENG Si-Chao, WU Qiao-Ling. Determination of Nitrate in Seawater with Valve-free Continuous Flow Analysis[J]. Chinese Journal of Analytical Chemistry, ;2017, 45(2): 151-156. doi: 10.11895/j.issn.0253-3820.160790 shu

Determination of Nitrate in Seawater with Valve-free Continuous Flow Analysis

State Key Laboratory of Marine Environmental Science, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China

Received Date: 28 October 2016
Revised Date: 12 November 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (No.41306090)

A valve-free continuous flow method and instrument were established, with only a multi-channel pump for delivering the sample and reagent, and without any injection or solenoid valves and sample loop for selecting and adding the sample or reagent. Nitrate was reduced to nitrite with Cu-Cd reductant column, and then detected with spectrophotometric detector. The proposed method was suitable for determination of nitrate at normal level in most of estuary and coastal seawaters. With the optimum parameters, the linear range and detection limit were 5-180 μmol/L and 0.27 μmol/L, respectively. The samples of 10 and 80 μmol/L nitrate were continually measured for 11 times, and the relative standard deviations were 1.4% and 1.3%, respectively. The recovery of real samples at different salinity ranged between 99.4% and 106.1%. There was no significant difference in the analytical results between the proposed method and the flow injection analysis (FIA). In comparison with FIA, the method and instrument were less cost and easy to operate, and was suitable to be applied in general laboratories and field for continuous monitoring. The method was successfully used to measure the nitrate in seawater samples in Xiamen's Western Harbor and monitor nitrate in Jiulongjiang estuary.
- Valve-free,
- Continuous flow analysis,
- Seawater,
- Nitrate
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