Phosphate fertilizers — The typical P2O5 content in triple superphosphate (TSP) is approximately what percentage range?

Introduction:
Triple superphosphate (TSP) is a concentrated phosphate fertilizer produced by reacting phosphate rock with phosphoric acid. Its nutrient analysis is commonly expressed as percent P2O5, a conventional oxide basis used in fertilizer trade and labeling.

Given Data / Assumptions:

• TSP consists largely of monocalcium phosphate monohydrate.
• Commercial grades are standardized within a narrow range.
• Percentages refer to mass percent P2O5 equivalent.

Concept / Approach:

Typical TSP grades are around 46% P2O5, often labeled as 0–46–0. Therefore, the acceptable range encapsulating most commercial product is about 42–50% P2O5. Lower ranges (15–20%) correspond to single superphosphate (SSP), while extremely high numbers (70%+) are unrealistic for bulk fertilizers and would imply purified phosphate chemicals rather than granular fertilizers.

Step-by-Step Solution:

Verification / Alternative check:

Fertilizer specifications and datasheets list TSP at approximately 46% P2O5 with minor impurities and conditioning agents.

Why Other Options Are Wrong:

B: SSP range; C/D: unrealistically high for commercial TSP; E: too low for TSP.

Common Pitfalls:

Confusing total P with P2O5 equivalent or mixing up SSP and TSP typical analyses.

Final Answer:

42–50