Which calcium procedure utilizes lanthanum chloride to eliminate interfering substances?

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Multiple Choice

Which calcium procedure utilizes lanthanum chloride to eliminate interfering substances?

Explanation:
Lanthanum chloride is used as a masking agent in atomic absorption spectrophotometry to suppress interfering substances during calcium measurement. It binds or sequesters common interferents such as phosphate, carbonate, and sulfate, preventing them from distorting the calcium signal and improving accuracy. This approach of masking interferences is characteristic of calcium determination by AAS, whereas other calcium procedures rely on different mechanisms (precipitation, chelation, or colorimetric complex formation) that do not use lanthanum chloride for interference suppression.

Lanthanum chloride is used as a masking agent in atomic absorption spectrophotometry to suppress interfering substances during calcium measurement. It binds or sequesters common interferents such as phosphate, carbonate, and sulfate, preventing them from distorting the calcium signal and improving accuracy. This approach of masking interferences is characteristic of calcium determination by AAS, whereas other calcium procedures rely on different mechanisms (precipitation, chelation, or colorimetric complex formation) that do not use lanthanum chloride for interference suppression.

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