Methodological improvements in spectroscopic detection of ammonium and sulphate ions

The presence and concentration of these ions are of significant environmental and health concern; high levels of NH₄⁺ ion can indicate pollution and lead to eutrophication, while SO₄^2- ion is a key component in acid rain formation and contributes to water hardness. Current conventional methods, such as titration or gravimetric analysis, are often time-consuming, require large sample volumes, and lack the sensitivity needed for real-time measurements in complex samples. The statement of the problem is the lack of a rapid, selective, and cost-effective method for the simultaneous or sequential low-concentration analysis of both ions within the same aqueous medium. This represents a research gap in field-deployable water quality assessment technologies. The solution proposed is the development and validation of a novel, UV-visible spectroscopic method coupled with appropriate chemical derivatization. This approach exploits the distinct absorption characteristics of specific chromophores formed by reacting NH₄⁺ with ninhydrin in basic condition. Sodium hydroxide solution created the basic condition for this reaction. The solution formed red color complex in basic conditions after 45-60 minutes and SO₄^2- with barium chloride followed by a turbidimetric measurement in the presence of conditioning reagents, which formed a cloudy nature after 10 minutes. The primary objectives are to optimize reaction conditions, establish accurate concentration for the detection of these ions, evaluate linearity, and assess the method's selectivity against common matrix interferences. In conclusion, the proposed spectroscopic method offers a sensitive, rapid, and straightforward alternative to traditional wet chemistry techniques. This method successfully enables the accurate, low-cost determination of NH₄⁺   and SO₄^2- in water samples, providing a valuable tool for environmental monitoring and water resource management. 

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