Full-automatic atmosphere nitrogen dry and wet deposition collecting device as well as sample collecting and detection method

Abstract

The invention discloses a full-automatic atmosphere nitrogen dry and wet deposition collecting device. A multi-linkage-rod support drive device is controlled by a rainwater sensor according to the rainwater condition. In rainy days, the rainwater sensor begins to work, an electric signal is transmitted to the multi-linkage-rod support drive device, a deposition barrel cap slides above a dry deposition barrel; when rain stops, the multi-linkage-rod support drive device drives the deposition barrel cap to a wet deposition barrel. According to the device, atmosphere nitrogen is collected to be deposited in an underlying surface substitution method distinguishing mode, and the sample loss caused by the small rainfall amount and the air drying effect can be diminished greatly in a diluting collection mode; the opening and the closing of a conventional slide-type cover plate can be prevented from being interfered by impurities; meanwhile, soluble gaseous nitrogen between an underlying surface and the atmosphere interface can be collected passively in drying deposition collection. The invention also optimizes an atmosphere nitrogen dry and wet deposition sample pretreatment and analysis testing system. The full-automatic atmosphere nitrogen dry and wet deposition collecting device and the atmosphere nitrogen dry and wet deposition sample pretreatment and analysis testing system, which are provided by the invention, are suitable for collecting and analyzing the atmosphere nitrogen deposition, are reliable and feasible, and have a favorable application prospect in the technical field of environment protection.

Description

technical field [0001] The invention relates to a sampling device, in particular to an automatic collection device for atmospheric nitrogen dry and wet deposition and a sample detection method. Background technique [0002] Atmospheric nitrogen deposition is an important component of the nitrogen cycle, and has undergone profound changes in recent years under the dual influences of nature and man-made. Since the middle of the 20th century, with the rapid consumption of fossil fuels, the substantial increase in the use of chemical nitrogen fertilizers, and the rapid development of animal husbandry, human activity-induced reactive nitrogen emissions have increased sharply, and atmospheric nitrogen deposition is linearly related to reactive nitrogen emissions. As the intensity of human activities continues to increase, reactive nitrogen emissions will increase significantly, and atmospheric nitrogen deposition will increase accordingly. [0003] The increase of atmospheric nit...

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Problems solved by technology

However, the results obtained by different monitoring methods are often quite different

When the precipitation is less (less than 2mm), or when the wind is accompanied by drizzle, the wet sedimentation sample may be affected by the air-drying effect, resulting in errors; and when the heavy rain occurs (higher than 200mm), the sample may overflow from the container, However, it is difficult to simulate the actual wind field conditions in real time by using active collectors. At the same time, due to the non-linear change between the wind field and the diffusion of nitrogenous substances in the atmosphere, segmental sampling cannot obtain continuous data of the whole time series, which has a negative impact on the estimation of atmospheric nitrogen deposition In addition, the collection devices currently on the market can only divide nitrogen deposition into dry particle state, precipitation combined state and gaseous state, and the differences in sample collection methods often bring large system errors, and it is difficult to realize Synchronous monitoring; dry and wet sedimentation conversion mostly adopts conventional horizontal sliding devices, and debris such as dust often interferes with the sliding of the barrel lid, thereby affecting the distinction between dry and wet sedimentation; there is no unified sample pretreatment and analysis method at present, and different pretreatment Treatment methods and detection methods, the results of atmospheric nitrogen deposition are often quite different

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