Method of calibrating ebullition rate based on tension sensor in eutrophic waters

Abstract: A method based on tension sensor was deployed to calibrate the ebullition rate in the eutrophic waters. The ebullition was collected using sealed glass bottle connected to a transparent collector and the weight of ebullition in the collector was detected in every hour in the day or night. The transparent collector was used under the water because of its transparent did not shield the light and affect the normal ecosystem activity under the light in water. All the ebullition was collected by the transparent collector connected to a sealed glass bottle through the rubber tube. The sealed glass bottle was fitted with two rubber tubes. The one was used to collect ebullition, and the other was used for drainage. The sealed glass bottle was filled with water first. With the ebullition entering into the sealed glass bottle, the weight of the sealed glass bottle was reduced. The change of the weight of the sealed glass bottle reflected the change of the ebullition. The weight of the sealed glass bottle can be detected by the tension sensor in situ. The weight of the sealed glass bottle was related to the ebullition quantity of the eutrophic waters. The rate of weight reduction was related to the ebullition rate of the eutrophic waters. All of the data can be measured and transmitted by a tension sensor, and collected by the monitoring system in a computer. The analysis and statistics about the ebullition quantity and rate can be monitored through the system software. The method can monitor the ebullition in the eutrophic waters in every minute. It had less artifacts compared to the manual monitoring which is inefficiency, low accuracy, higher complexity and labor intense. The method can completely detect the ebullition in the every time node during a day or night. Not only the method can monitor ebullition rule to reflect ecosystem activity in the eutrophic waters during the day, but also during the night. The results indicated that the method could detect the ebullition rates from 57 to 539 g/(m2?h) in the day with the high temperature, and the ebullition rates from 49 to 280 g/(m2?h) in the night with the low temperature in the near optical layer. With this method, we determined ebullition quantity change with time and correlated the ebullition rates and temperatures, light intensities in the environment. Through detecting ebullition quantity and rates in the time node and using the gas chromatography instrument to analyze the component about gas which was collected in a time node, it was found that there were many kinds of gases in the ebullition, and ebullition quantity and rates of each kind of the gas in the eutrophic waters at the different time nodes can be determined. So the ebullition rate at the divided-period contributed to assess the N2, N2O ebullition fluxes in the eutrophic waters.