ATR FTIR Offers Rapid Quantification of Aragonite Carbonates

In a recent issue of the European Journal of Mineralogy, Mahmoud Alkhatib, Nabil Thabteh, Fuad Al‑Rimawi, and Mutaz Qutob reported a new analytical approach using attenuated total reflection Fourier transform infrared (ATR FTIR) spectroscopy to analyze aragonite‑group carbonates¹. The study appears in volume 38, pages 557–565, published in 2026¹.

The researchers applied ATR FTIR to synthetic mixtures of aragonite, strontianite, and witherite—three carbonate minerals. Unlike conventional X‑ray diffraction, their method requires no sample preparation, making it fast and user‑friendly¹.

A key innovation is the development of calibration curves based on absorbance ratios between characteristic peaks. By correlating these ratios with known concentrations, the team achieved accurate quantitative results for both strontianite and witherite within mixed samples¹. This reduces variability caused by measurement conditions such as temperature or humidity, which often affect FTIR readings.

Expert context underscores that rapid, non‑destructive techniques are increasingly valuable in mineralogical research. Traditional methods like XRD can be time-consuming and require meticulous sample handling; ATR FTIR offers an efficient alternative while maintaining precision. Moreover, being able to quantify minor components such as strontianite and witherite helps geologists reconstruct pressure‑temperature histories of metamorphic environments.

While the study focuses on synthetic mixtures, its implications for natural rock analysis remain promising. Future work may involve applying the technique to real-world specimens, validating its robustness across diverse mineral assemblages¹.

Overall, this new ATR FTIR protocol represents a practical advancement for mineralogists seeking quick, reliable quantification of aragonite‑group carbonates without the logistical burdens of conventional diffraction methods¹