Validating modern methods for impurity analysis in fluoride salts

Assessment of Molten Eutectic LiF-NaF-KF Density through Experimental Determination and Semiempirical Modeling

“…Specific details regarding the purification process are not publicly available. However, as noted by Sulejmanovic et al, previous corrosion tests and ICP-OES analysis on a sample from this batch indicated low levels of impurities …”

“…However, as noted by Sulejmanovic et al, previous corrosion tests and ICP-OES analysis on a sample from this batch indicated low levels of impurities. 48 The purity of the salt sample used in these measurements was characterized through combustion analysis on two LECO ONH836 instruments, oxygen hot extraction, inductively coupled plasma mass spectrometry on a Thermo Scientific Finnigan Element 2 instrument, glow discharge mass spectrometry, and capsule corrosion experiments. Additional details on the salt characterization are described in Sulejmanovic et al 48 Table 2 summarizes the details on the sample chemistry, purification, and purity adapted from Sulejmanovic et al The salt samples used in the measurements discussed herein were prepared and stored in argon (Ar) gloveboxes at 0.4 ppm oxygen concentration and 0.1 ppm moisture levels or lower.…”

Corrosion of 316H stainless steel in flowing FLiNaK salt

“…Previous reports of similar FLiNaK salts from the same source suggested it was relatively pure with low corrosivity [35]. The 366 ppm of Zr in the salt is notable, and may have accounted for the low observed corrosion rate [36]. Cheng et al observed Zr deposition on stainless steel samples exposed to FLiNaK salt with Zr addition, [37] although the Zr concentration in the salt used for that work (1.9%) was much higher than in the salt used for the present work…”

Corrosion of 316H Stainless Steel in Flowing FLiBe (LiF-BeF₂)

“…The purified, commercially produced Li2BeF4 (FLiBe) salt contained impurities shown in Table 1 with reported values similar to two batches of salt made at ORNL (listed as #1 & #2). Table 1 focuses on the elements that were changing in the salt, more extensive salt analyses have been reported elsewhere [21]. Typical procedures used to purify salt using H2-HF have been presented elsewhere [8][9][10].…”