Method for rapid detecting chemical fertillizers effective phosphorus content

A detection method, effective phosphorus technology, applied in color/spectral characteristic measurement, analysis through chemical reaction of materials, material analysis through observation of the influence of chemical indicators, etc., can solve problems such as cumbersome detection steps, and achieve The effect of high sensitivity and good correlation

Active Publication Date: 2010-09-22
XIAMEN STANDARDS SCI INSTR
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Problems solved by technology

[0006] The main purpose of the present invention is to overcome the deficiencies in the past that the detection of available phosphorus in chemical fertilizers can only be done in the laboratory, after complex and high-temperature sample processing and cumbersome detection steps, and must be completed by professionals to accurately detect, and a new method is proposed. Rapid detection and detection method of available phosphorus content in chemical fertilizers

Method used

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Embodiment Construction

[0014] A specific embodiment of the present invention will be described below.

[0015] This embodiment provides a kind of rapid detection method to available phosphorus content in chemical fertilizer, and the basic principle that this method is based on is: after adding extractant, the water-soluble phosphorus and citrate-soluble phosphorus composition of chemical fertilizer sample is extracted once under normal temperature condition, Phosphorus in the extract is converted into orthophosphoric acid under acidic conditions, and the orthophosphate ion combines with ammonium molybdate to form ammonium phosphomolybdate, which is reduced to molybdenum blue by hydroquinone and sodium sulfite. The amount of molybdenum blue, that is, the depth of the color, is directly proportional to the available phosphorus content in the fertilizer, so the approximate content of available phosphorus in the tested fertilizer sample can be obtained by comparing its color with the pre-made standard co...

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Abstract

The invention discloses a rapid testing method of effective phosphor content of fertilizer, which comprises the following steps: allocating several parts of potassium dihydrogenphosphate solution with varied density of P2O5 sequently as standard solution; adding ammonium molybdate solution, hydroquinone and sodium sulfite powder-shaped solid in each standard solution; obtaining the known effective phosphor content and the contrast liquid of each standard with color; adding EDTA in the solution of fertilizer sample as extractor; extracting soluble and citrate-solving phosphor together in the fertilizer; diluting and adding nitric acid solution; obtaining the disposing liquid of sample; adding ammonium molybdate solution, hydroquinone and sodium sulfite powder-shaped solid in the sample; obtaining the contrast liquid of sample with color; comparing the color of contrast liquid and the color of each contrast liquid of standard sample; obtaining the effective phosphor content of the detected fertilizer. The invention realizes the rapid phosphor content detection, which is fit for rapid on-site detection for non-professional person.

Description

technical field [0001] The invention relates to a chemical fertilizer detection method, in particular to a rapid detection method for the content of available phosphorus in chemical fertilizers. Background technique [0002] At present, the quality inspection of chemical fertilizers in China is mainly undertaken by provincial quality and technical supervision bureaus, and in some places by municipal quality and technical supervision bureaus, and the detection methods adopted by the above professional departments have always been the national standard methods formulated by my country in the 1980s. The detection speed of the method is far from meeting the actual supervision needs. Generally, it takes about 15 days from sampling to reporting. However, the characteristics of chemical fertilizers in the circulation field have obvious time constraints. Wholesale to rural retailers, and may be purchased by farmers and applied to the fields in just a few days, so too long testing cycl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78G01N21/25
Inventor 汤新华
Owner XIAMEN STANDARDS SCI INSTR
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