Determination of Iodine in CsGeI3 by Inductively Coupled Plasma Atomic Emission Spectrometry

An inductively coupled plasma atomic emission spectrometry (ICP–AES) method for the determination of iodine in CsGeI3 perovskite materials has been developed. The method involves microwave digestion with a hydrochloric-nitric acid system (3 : 1) at 120°C for 10 min, followed by analysis using optimized ICP–AES parameters (radio frequency power: 1150 W, cooling gas flow: 12.5 L/min). The linear range of iodine determination was 1.00–60.00% with a determination coefficient (R2 = 0.999). Recovery rates ranged from 98.6 to 102.1%, and the relative standard deviation (n = 11) was ≤3.4%. The method demonstrated high accuracy and precision, validated through analysis of CsGeI3 samples from diverse sources.