研究目的
To extend correlations between spectral measurements and the concentration of NaCl and KCl in water up to saturation and to differentiate between solutions of these salts with unknown concentrations.
研究成果
The research successfully developed correlations using near-infrared spectroscopy to differentiate between NaCl and KCl solutions and estimate their concentrations up to saturation with high accuracy (average error of 0.9%). This provides a foundation for future work on multi-salt solutions and temperature effects.
研究不足
The study is limited to single-salt solutions and does not account for multi-salt samples or temperature variations beyond 25°C. The method's sensitivity is reduced for concentrations below 3% of maximum salinity.
1：Experimental Design and Method Selection:
The study used near-infrared spectroscopy to measure absorbance spectra of NaCl and KCl solutions up to saturation. Linear correlations were developed to differentiate between salt species and estimate concentrations based on specific wavelengths.
2：Sample Selection and Data Sources:
Single-salt solutions of NaCl and KCl were prepared using reagent-grade salts and deionized water, with concentrations ranging up to near-saturation. Masses of salt and water were recorded for molar and mass-based concentration calculations.
3：List of Experimental Equipment and Materials:
A dual-beam spectrophotometer (Cary-5000, Agilent Technologies), quartz cuvettes with 10 mm path length, reagent-grade NaCl (
4：9%) and KCl (6%) from Fisher Scientific, deionized water, Class A volumetric flasks, and a dual-cell temperature controller. Experimental Procedures and Operational Workflow:
Solutions were mixed in volumetric flasks, spectra were collected between 180 and 1800 nm at 1-nm intervals with a 2-nm bandwidth, using a temperature controller set to 25°C. Scans were taken in triplicate with sample replacement, and baseline corrections were applied.
5：Data Analysis Methods:
Linear regression was performed at specific wavelengths to develop correlations for concentration estimation and species differentiation, using coefficients of determination (R2) and error calculations.
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