**Appearance:** Potassium dihydrogen phosphate (KHâ‚‚POâ‚„) should appear as colorless tetragonal crystals or a white crystalline powder. If the product appears as small crystals or fine powder, it is considered normal and does not indicate any quality issues.
**Content:** According to the HG2321-92 standard, agricultural-grade potassium dihydrogen phosphate must have a minimum content of 92% on a dry basis for qualified products, and 96% for first-grade agricultural products. However, most products currently available in the market are labeled with a content of ≥98%. This higher specification is often used by manufacturers to meet modern agricultural demands.
**Purchasing Tips:**
(1) Authentic potassium dihydrogen phosphate should clearly state the content of KH₂PO₄ on a dry basis, which should be ≥98%. Be cautious of products that label "total content of other elements ≥98%" or similar vague terms, as these may be misleading.
(2) Some products may claim a 98% KH₂PO₄ content but still fail to meet quality standards. The HG2321-92 standard also specifies that the potassium oxide (K₂O) content must be ≥33.2%, which is an important indicator of the product's quality and nutrient value.
**Price Consideration:** Genuine potassium dihydrogen phosphate is relatively expensive due to its high nutrient concentration and purity. If you encounter a product priced significantly lower than the market average, it could be a counterfeit or low-quality alternative. Always check the label carefully and purchase from reliable suppliers.
**Source: Agricultural Science and Technology Newspaper**
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