Rapid detection method for fertilizer nutrients

Abstract

The present invention discloses a rapid detection method for fertilizer nutrients. According to the method, 1-5 mL of concentrated sulfuric acid is added during the sample digesting process, 0-2 mL of perchloric acid (or hydrogen peroxide) is added as a digestion agent, and the resulting digested solution requiring detection can be used for colorimetric determinations or turbidimetric determinations of nitrogen, phosphorus and potassium. The method of the present invention has advantages of wide application range, stable reagent, low cost, easy availability, short digestion time, complete digestion, convenient operation, high accuracy, time saving, labor saving, and the like. With the method of the present invention, the nitrogen content, the phosphorus content and the potassium content in the fertilizer can be rapidly and efficiently detected, such that the rapid detection requirements of the fertilizer sample during the fertilizer production process and the fertilizer sale process are met, and the purposes of time saving, labor saving, convenience, rapidness, accuracy and reliability are achieved.

Description

technical field [0001] The invention relates to the field of laboratory analysis, in particular to a rapid detection method for fertilizer nutrients. Background technique [0002] With the rapid development of my country's fertilizer industry, especially the application of fertilizers is increasing day by day both in terms of quantity and variety. Moreover, the content of various fertilizers has national or enterprise-regulated standards. Therefore, it may not be necessary to test the nutrient content of fertilizers under normal circumstances. However, the label may be lost or confused during transportation or storage; some fertilizers may also deteriorate during storage; in some small factories due to the limitation of raw material sources and technical equipment, the composition and content of fertilizers can also change greatly. For this reason, it is necessary to test some fertilizers and compare them with national or enterprise standards in order to protect the intere...

AI Technical Summary

Problems solved by technology

In GB / T22923 fertilizer ammonium nitrogen adopts automatic azotometer method, nitrate nitrogen adopts test powder colorimetric method, and phosphorus and potassium adopts flow analyzer method. All need to be extracted separately, which is labor-intensive and time-consuming

At present, the distillation titration method (GB / T8572) is mostly used for nitrogen detection in fertilizers, the quinoline phosphomolybdate mass method (GB / T8573) is mostly used for phosphorus, and the potassium tetraphenylborate gravimetric method (GB / T8574) is used for potassium. Wide range, but the requirements for the experimental conditions and the quality of laboratory personnel are too high, and because each individual measurement is extremely time-consuming, it is not suitable for rapid detection of fertilizers

The common disadvantages of the above-mentioned methods are that nitrogen, phosphorus and potassium are extracted separately, which requires high detection equipment and cannot be applied to low-cost colorimetric rapid detection. The reason is that there is no general nutrient extraction and determination method, and Can eliminate the interference of various ions when comparing color or turbidity

[0005] Therefore, it is an urgent problem to be solved to provide a rapid detection method for fertilizers with fast detection time, high detection accuracy, low detection cost and the ability to simultaneously detect nitrogen, phosphorus and potassium content

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