科研之友
微信
新浪微博
Facebook
分享链接
摘要
Quantification of analytes present in organic solvents or high salt content aqueous solutions using ICP-OES with minimal to no sample processing is desirable to improve analysis turnaround time and decrease sample cost. This work describes procedures used for Sr, V, and Y quantifications in 1-pentanol, 1-octane, 1-decanol, n-octane, and kerosene, substitute seawater, and NaCl solutions, with concentrations as high as 5 molal, using ICP-OES with a standard nebulizer and spray chamber configuration. The detection limits of analyte in those extreme conditions decrease by less than a factor of ten compared to element quantification in dilute aqueous solution; however, the instrument maintained its normal precision and linearity in response. In dilute HNO3, Sr, V, and Y feature LODs of 4 x 10(-2), 4, and 0.2 ng L-1, respectively. A medium of 5 m NaCl shows LODs of 1, 4, and 4 ng L-1 for Sr, V, and Y, respectively. Organic analyses revealed the presence of a number of molecular emissions that occurred during the ionization of carbon; these emissions drastically increased backgrounds in the region around 400 nm. Dodecane solutions were found to require the addition of a metal complexant (we used di-(2-ethylhexyl) phosphoric acid) to ensure elemental stability of solution. With the addition of the complexant to dodecane solutions, the LODs were 10, 5, and 4 ng L-1 for Sr, V, and Y, respectively.
- 出版日期2017-7-1
