Sanyal Kaushik, Saha Abhijit, Sarkar Arnab, Deb Sadhan Bijoy, Pai Rajesh V, Saxena Manoj Kumar
Fuel Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India.
ACS Omega. 2023 Oct 24;8(44):41402-41410. doi: 10.1021/acsomega.3c05139. eCollection 2023 Nov 7.
The extensive use of lanthanide elements in the medical, electrical, agricultural, and nuclear fields has increased their contamination in the environment. The detrimental effect of lanthanides on human health can be reduced or eliminated by their fast determination in the concerned specimen. For this purpose, an offline conjugation of the cloud point extraction (CPE) process with total reflection X-ray fluorescence (TXRF) spectrometry was done. This process was found to provide simple, quick, and precise simultaneous determination of ten lanthanides whose emission lines have a high degree of overlap at the ultratrace level. ,,','-tetra-octyl-diglycolamide in triton X-114 micelles was found to offer a selective CPE of all of the lanthanides in the presence of higher concentrations of naturally abundant cations and anions. A multivariative partial least-squares regression (PLSR) calibration approach was preferred due to the complex overlapped spectra of L lines of the lanthanides. Ten lanthanides, viz., La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Tm, and Lu, were simultaneously determined by this method, having concentrations in the range from 10 to 5 × 10 μg L. The proposed method was validated by analyzing three certified reference materials (CRMs), viz., NASS-7 seawater, SRLS-6 river water, and NIST 1640a natural water, via standard addition with the relative standard deviations of ≤10%.
镧系元素在医学、电气、农业和核领域的广泛应用增加了它们在环境中的污染。通过在相关样本中快速测定镧系元素，可以降低或消除其对人体健康的有害影响。为此，将浊点萃取（CPE）过程与全反射X射线荧光（TXRF）光谱法进行了离线联用。结果发现，该过程能够简单、快速且精确地同时测定十种镧系元素，这些元素的发射线在超痕量水平具有高度重叠。发现在Triton X-114胶束中的,,','-四辛基二甘醇酰胺在存在较高浓度的天然丰富阳离子和阴离子的情况下能够对所有镧系元素进行选择性浊点萃取。由于镧系元素L线的光谱复杂且重叠，因此采用多元偏最小二乘回归（PLSR）校准方法。该方法同时测定了十种镧系元素，即La、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Tm和Lu，浓度范围为10至5×10 μg/L。通过分析三种有证标准物质（CRM），即NASS-7海水、SRLS-6河水和NIST 1640a天然水，并采用标准加入法，相对标准偏差≤10%，对所提出的方法进行了验证。
