Abstract

Phosphate ions (PO₄³⁻), commonly present in carbonated beverages as phosphoric acid, play an important role as acidulants and flavoring agents. However, excessive dietary intake of phosphates has been associated with adverse health effects, including impaired calcium metabolism, reduced bone mineral density, and increased risk of kidney disorders. In this context, accurate determination of phosphate content in widely consumed cold drinks is essential for both nutritional assessment and public health monitoring. The present study aims to perform both qualitative detection and quantitative estimation of phosphate ions in selected commercial cold drink samples. Qualitative analysis was carried out using the ammonium molybdate test under acidic conditions, confirming the presence of phosphate ions via the formation of a characteristic yellow precipitate of ammonium phosphomolybdate. Quantitative estimation was conducted using the molybdenum blue spectrophotometric method, based on the reduction of phosphomolybdic acid to a blue-colored complex, with absorbance measured at 880 nm. The analysis revealed that all tested beverages contained detectable levels of phosphate, with significant variation among brands. The observed concentrations were compared with permissible dietary intake levels and discussed in terms of potential health implications. This study underscores the necessity for continuous monitoring and regulation of phosphate additives in soft drinks to ensure consumer safety.