Method for determining boron in fertilizer by using flow injection method

Abstract

The invention discloses a method for determining boron in fertilizer by using a flow injection method. The method comprises the following steps: weighing 1-5g of a sample, putting the sample into a 250mL polytetrafluoroethylene flask, adding 0.25-5mg of boron into the sample, enabling the accuracy to reach to 0.001g, adding 150mL of water, covering a watch glass, boiling on an electric heating plate for 15 minutes, taking down, performing cooling to room temperature, transferring the sample into a 250mL volumetric flask, performing diluting with water to a scale, uniformly mixing, carrying outdry filtration, and discarding the first few milliliters of filtrate; reserving filtrate for determining boron, and entering an analysis step after the determination is finished. According to the method, the boron element in the fertilizer is analyzed, an advanced flow injection analyzer is adopted, the technology is advanced, economical and reasonable, the qualitative and quantitative detectiontask of the boron in the fertilizer is completed, large-batch rapid and simple detection can be achieved, and the detection sensitivity and recognition capacity are improved; the method can meet the requirement of detection limit of boron in related fertilizers at home and abroad, and achieves high-quality and high-efficiency detection effect.

Description

technical field [0001] The invention belongs to the technical field of boron determination methods, and in particular relates to a method for determining boron in fertilizers by a flow injection method. Background technique [0002] Boron is an indispensable trace element for the normal growth and development of plants, which can promote the vigorous growth of plants and the normal development of reproductive organs. Boron deficiency can cause beet "brown heart disease", rape "flowers but not fruit", cotton "buds but not flowers", celery "neck break disease". However, for some plants that need less boron, a large amount of boron will cause boron poisoning, resulting in chlorotic and scorched leaves, and even withering and premature shedding. Therefore, the determination of boron in fertilizer is an important measure to ensure the quality and rational application of boron fertilizer. Especially in recent years, the boron fertilizer market has a variety of varieties, and a l...

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Problems solved by technology

[0003] The research history of boron is long, and as early as the beginning of the 19th century, boron is just recognized as one of the essential trace elements for plant growth and development, and in seven kinds of plant essential trace elements, the detection method of boron in the prior art fertilizer includes ( 1) Titration method: "Industrial Boric Acid" GB / T 538-2006 for acidic fertilizers (pH7) Both methods are simple acid-base neutralization titration, but due to the interference of other acidic substances, the measurement results of boric acid are high and the human error is relatively large; secondly, when measuring, the color change reaction process of the mixed indicator is very complicated. The color gradient is not obvious, and it is easy to cause large errors due to chromatic aberration

(2) Spectrophotometry: "Determination of Copper, Iron, Manganese, Zinc, Boron, Molybdenum Content in Compound Fertilizers" GB / T 14540-2003 This method has a large error in the determination of high-concentration samples, and this standard is suitable for determination Compound fertilizers with a boron content of 0.005% to 0.5%; in addition, the measurement error of colored samples is relatively large, and the results are unstable

However, due to expensive equipment and high requirements for operators, it is difficult to popularize in laboratories

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