Determination of fluoride in urinary calculi using a quantitative microdiffusion method

Area of Science:

• Analytical Chemistry
• Clinical Chemistry
• Biochemistry

Background:

• Urinary calculi (kidney stones) are complex mineral formations.
• Accurate fluoride quantification in calculi is crucial for understanding stone formation and treatment.
• Existing methods for fluoride separation from calculi can be complex and time-consuming.

Purpose of the Study:

• To develop and validate a novel microdiffusion method for isolating fluoride from urinary calculi.
• To assess the accuracy, recovery, and reproducibility of the developed method.
• To apply the method for analyzing fluoride content in human urinary calculi.

Main Methods:

• Samples of urinary calculi were digested using silicone-impregnated nitric and perchloric acid mixtures at 75°C.
• A specially designed diffusion cell was employed for the separation process.
• Quantification of diffused fluoride was performed using an ion-sensitive electrode.

Main Results:

• The microdiffusion method demonstrated effective separation of fluoride from other ions in urinary calculi.
• Recovery, accuracy, and reproducibility of the method were assessed using test samples.
• Results from 20 Indian-origin urinary calculi samples were presented and discussed.

Conclusions:

• The developed microdiffusion technique provides a reliable and efficient means for fluoride analysis in urinary calculi.
• This method can aid in the etiological investigation of kidney stone formation.
• Further application of this method can contribute to improved clinical management strategies for urolithiasis.