1、Method development and validation for the determination of potassium

Fertilizer samples are tested for determining their nutrient contents; however, different methods give varying results. Therefore, the major objective of this study was to develop and validate potassium determination method by flame photometry technique.

2、NY/T 2540

NY/T 2540-2014肥料 钾含量的测定本标准规定了肥料钾含量测定的重量法、火焰光度法、等离子体发射光谱法等试验方法。 本标准适用固体或液体肥料中钾含量、总钾含量的测定。 本标准也适用于土壤调理剂.

3、Microsoft Word

During its first phase of method review, the IFA Method Harmonization Working Group decided to evaluate the methods used to determine potassium content (expressed as K2O) in potassium chloride (KCl) fertilizers in global markets.

4、(PDF) Improvement on Determination of Water

In this study, a small visible spectrometer and a small near-infrared spectrometer were used to collect spectrum information of 33 different common chemical fertilizers including compound...

Discussion on the determination method of potassium content in humic

At present, the standard for determining potassium content in water-soluble fertilizers containing humic acid is the NY/T 1977-2010 potassium tetraphenylborate gravimetric method. This method is operated manually, the steps are relatively cumbersome, and the detection efficiency is low.

2026 Water

Explore the 2024 analysis of potassium in water-soluble fertilizers, focusing on composition, regulatory standards, and future trends for sustainable agriculture.

Determination of potassium in fertilizers

[Pg.536] Water-soluble potassium (expressed as K2O) can be determined by manual or automated flame photometric and tetraphenylboron titration methods for all types of fertilizer samples. Atomic absorption can be used for samples below 5% K2O to maintain the highest degree of precision and accuracy.

Potassium in fertilizers

Traditionally potassium is determined gravimetrically or by flame photometry. In this Application Note, an alternative method is presented, where potassium is determined a precipitation titration. Various solid and liquid NPK fertilizers with potassium contents between 10 and 27% were analyzed.

NY/T 1977

This standard specifies test methods for determination of total nitrogen, phosphorus and potassium content in water-soluble fertilizers. This standard is applicable to determination of total nitrogen, phosphorus and potassium content in liquid or solid water-soluble fertilizers.

Real

To measure NPK, three approaches are used: electrical conductivity testing, optical techniques, and electrochemical methods. These measurements are generally performed in a centralized laboratory.

Potassium is an essential plant nutrient that plays a critical role in plant growth and development. In agricultural production, the rational application of potassium fertilizers can effectively improve crop yield and quality. determining the potassium content in water-soluble fertilizers is of great significance for guiding agricultural practices. Below are some commonly used methods for potassium determination:

1. Flame Photometry Flame photometry is a widely used method for measuring potassium ions. It involves burning the sample to excite potassium ions, which emit light at specific wavelengths. The intensity of this light is measured to determine the potassium ion concentration. This method offers high sensitivity and accuracy, making it suitable for rapid testing of large batches of samples. it requires specialized equipment and reagents, and the operation is relatively complex.

2. Atomic Absorption Spectroscopy (AAS) Atomic absorption spectroscopy (AAS) determines potassium ion content based on the principles of atomic emission spectroscopy. The method first converts potassium ions in the sample into potassium salts, then uses a flame atomic absorption spectrometer to measure the emission signals of potassium atoms. By comparing the results with a standard curve, the potassium ion content is quantified. AAS boasts high sensitivity, accuracy, and stability, suitable for detecting potassium ions across a wide range of concentrations.

3. Potentiometric Titration Potentiometric titration measures potassium ions based on chemical reaction principles. A known concentration of potassium hydroxide solution is added to the sample, allowing potassium ions to react with hydroxide ions to form soluble potassium salts. The potassium ion content is determined by monitoring changes in the pH of the solution. This method is simple and fast but requires precise control of titration conditions to ensure accuracy.

4. Ion Chromatography Ion chromatography separates and measures potassium ions using ion exchange principles. Potassium ions are isolated from other ions in the sample, then detected using an ion-selective electrode or electrochemical sensor. This method offers high resolution, selectivity, and sensitivity, making it suitable for analyzing complex samples. it involves high equipment costs and relatively complex operations.

5. Atomic Fluorescence Spectroscopy (AFS) Atomic fluorescence spectroscopy (AFS) measures potassium ions based on the principles of atomic excited-state radiation. The sample’s potassium ions are converted into potassium salts, and an atomic fluorescence spectrometer is used to detect emission signals. By comparing the results with a standard curve, the potassium ion content is determined. AFS provides high sensitivity, accuracy, and stability, suitable for detecting potassium ions across various concentration ranges.

6. Colorimetry Colorimetry determines potassium ion content by measuring color changes resulting from chemical reactions. A colorimetric agent (e.g., potassium chromate, ammonium molybdate) is added to the sample, causing potassium ions to react and form colored products. The potassium ion concentration is inferred from the color intensity and absorbance. This method is simple and cost-effective but has relatively lower accuracy and sensitivity.

multiple methods are available for determining potassium content in water-soluble fertilizers. The choice of method depends on factors such as sample properties, detection objectives, and cost. Combining multiple approaches in practical applications can enhance the accuracy and reliability of results.