Determination of rhodium in waste rhodium-aluminum oxide catalyst by inductively coupled plasma atomic emission spectrometry with potassium hydrogen sulfate fusion
FENG Lei, WANG Qin-long*, WANG Lei-lei, YANG Tai-bao, HUANG Chang-rong, LI Jing
Wanhua Chemical Group Co., Ltd., Yantai 264006, China
Abstract：The waste rhodium-aluminum oxide catalyst contains much rhodium. The recovery of rhodium from catalyst can reduce the production cost. Therefore, the accurate determination of rhodium content in waste rhodium-aluminum oxide catalyst is of great importance. However, the composition of waste rhodium-aluminum oxide catalyst is very complicated, and the sample cannot be completely dissolved by conventional wet digestion and microwave digestion methods. In proposed study, 0.1g of waste rhodium-aluminum oxide catalyst and 3.0g of potassium hydrogen sulfate were fused at 650℃ for 4h. The melt was dissolved with 10mL of 10% (volume fraction) sulfuric acid under heating. Then, the content of rhodium in sample solution was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The determination method of rhodium in waste rhodium-aluminum oxide catalyst by ICP-AES after fusion was established. The working conditions of ICP-AES were listed as follows: the radio frequency (RF) power was 1.20kW and the atomizing gas flow rate was 0.85L/min. The linear correlation coefficient of calibration curve was R2=0.9999. The detection limit was 0.01mg/L and the low limit of determination was 0.1mg/L. The content of rhodium in two waste rhodium-aluminum oxide catalyst samples was determined according to the experimental method. The relative standard deviation (RSD, n=9) of determination results was in range of 0.52%-0.56%. The recoveries were between 99.6% and 100.3%. The content of rhodium in two simulation samples of waste rhodium-aluminum oxide catalyst was determined according to the experimental method. The found results were consistent with the theoretical values.
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