The Inorganic Phosphorus Determination Kit market comprises analytical kits used to quantify orthophosphate in water, food, fertilizer, and industrial samples, a critical step for environmental compliance, food safety, and process control. Inorganic Phosphorus Determination Kit market size reached approximately $146 million in 2025, and the growth outlook projects a CAGR of 6.5% from 2026 to 2033, driving the market forecast toward $220 million by 2033. The expansion is propelled by tightening global phosphorus discharge regulations, rising demand for rapid water‑quality monitoring, and increased adoption of automated testing in the food‑pharma sector. Key forces shaping the industry include: (1) Regulatory pressure mandating stricter phosphate limits in effluents, (2) Technological innovation delivering more sensitive colorimetric and electrochemical platforms, and (3) Supply‑chain resilience as manufacturers diversify raw‑material sourcing to mitigate geopolitical risks.