Ammonia nitrogen analysis method suitable for multi-field sample detection

Abstract

The invention relates to an ammonia nitrogen analysis method applicable to detection of samples in multiple fields. The ammonia nitrogen analysis method comprises the following steps: (A1) a sample to be detected is placed into a sample injection device, a control system controls the sample to be detected to be automatically injected, a quantification module is switched to a quantification state and realizes quantification according to the fact that the sample to be detected is switched to a corresponding quantification volume, and the sample to be detected is an ammonia nitrogen sample solution in different fields; (A2) a switching module performs switching according to the sample to be detected to enable a dialysis module to selectively communicate with an analysis channel, and only one analysis channel is provided; (A3) the control system controls the quantification module to be switched to the sample injection state, and the sample to be detected with the quantified volume is mixed and reacted with a buffer solution, a first developing agent and a second developing agent in sequence under the pushing of a carrier solution, so that the concentration of the sample to be detected is acquired after detection and analysis are performed. The ammonia nitrogen analysis method has the advantages of simple structure, low cost, convenience for operation, wide application range and the like.

Description

technical field [0001] The invention relates to the field of nitrogen element analysis, in particular to a flow injection ammonia nitrogen analysis method suitable for sample detection in different fields. Background technique [0002] National regulations on nitrogen content limits in samples in different fields vary greatly, and many of them are even in different orders of magnitude. Therefore, at present, a number of analysis channels with different detection ranges are used to detect samples in different fields. Nitrogen uses a total nitrogen analysis channel with a detection range of 0.1-20 mg / L (calculated as N), and a Kjeldahl nitrogen analysis channel with a detection range of 50-600 mg / L (calculated as N) is used for the determination of Kjeldahl nitrogen in fertilizers. However, detection of multi-domain samples through multiple channels has the following drawbacks: [0003] 1. Using different analysis channels, that is, multiple analytical instruments for sample...

AI Technical Summary

Problems solved by technology

[0003] 1. Using different analysis channels, that is, multiple analytical instruments for sample detection in different fields, the cost is high, the instrument is large and covers a large area;

[0004] 2. Due to the large difference in the concentration of nitrogen in samples in different fields, there are differences in the detection flow path and reagent concentration in different channels. For the detection of samples in different fields, it is necessary to manually replace the detection flow path and prepare reactions with different concentrations. Reagents are inconvenient to operate, time-consuming and labor-intensive, and have extremely low efficiency; and the reaction reagents are toxic, and frequent preparation by operators may cause harm to the body