Paper
On-line Determination of Hydrazine in Environmental Water by Reference Flow Injection Analysis
- Authors:
- Lan Yu; Xinshen Zhang; Linyun Yu
- Abstract
- A new reference flow injection Spectrophotometric method for online determination of hydrazine was proposed in this paper, which was based on the condensation reaction of hydrazine with vanillin (3-methoxy-4-hydroxylbenzaldehyde), hydrazone formation. The resulting yellow colored product is stable in acidic medium and has a maximum absorption at 410 nm. Upon the optimal condition, the absorption intensity linearly increased with the concentration of hydrazine in the range from 2–1500 μg L-1 with a correlation coefficient of R2=0.9997 and the detection limit of the method was found to be 0.70 μg L-1. The sampling frequency is 20 samples h–1 and the relative standard deviation was 0.98% (n=11) at 100 μg L-1 of hydrazine. This proposed method was suitable for automatic and continuous analysis, and successfully applied to determine the content of hydrazine in river water, pond water, well water, real boiler water and waste water samples with the recoveries in the range of 99.0%–104.6%.
- Keywords
- Spectrophotometry Determination; Flow Injection; Hydrazine; Water Samples
- StartPage
- 13
- EndPage
- 18
- Doi