EVALUATION OF MOISTURE CONTENT CONSISTENCY USING STANDARD LOSS-ON-DRYING METHODS

Accurate moisture content determination is essential for quality control and material characterization in industrial and laboratory applications. Several techniques are commonly used for moisture determination; however, their consistency and agreement must be validated against traceable reference methods. This study aims to evaluate the agreement, consistency, and measurement uncertainty between two standard moisture determination techniques developed at the National Institute for Standards (NIS): the oven-drying (loss-on-drying) method and the moisture balance method. Moisture content measurements were performed on solid samples covering a wide range of moisture levels, with the oven-drying method serving as the reference technique. Statistical analyses, including correlation analysis, linear regression, bias evaluation, and Bland Altman analysis, were applied. Measurement uncertainty was evaluated in accordance with the Guide to the Expression of Uncertainty in Measurement (GUM). The results showed a strong linear association between the two methods, with a correlation coefficient of 0.89.