Mechanisms involved in chemical vapor generation by aqueous tetrahydroborate(III) derivatization

Optimization of chemical and instrumental parameters in hydride generation laser-induced breakdown spectrometry for the determination of arsenic, antimony, lead and germanium in aqueous samples

“…Several studies in the literature have shown that the reaction rate and signal sensitivity could be increased by the addition of an oxidizing agent: potassium hexacyanoferrate(III), K 3 [Fe(CN) 6 ] [ [43][44][45]. In order to increase the stability of lead hydrides, K 3 [Fe(CN) 6 ] was also used as an oxidizing agent in this study.…”

Mechanisms of chemical generation of volatile hydrides for trace element determination (IUPAC Technical Report)

“…A recent study on the role of K 3 Fe(CN) 6 in plumbane generation [63] was conducted using a chemifold similar to that reported in Fig. 6: THB and K 3 Fe(CN) 6 were mixed in T 1 , allowed to react in the mixing loop, then Pb II solution was merged with the reaction solution in T 2 .…”

“…These intermediates are formed by reaction of K 3 Fe(CN) 6 with THB and cannot be obtained by simple hydrolysis of THB in pure aqueous solution. The other hypotheses considering Pb II oxidation to Pb IV or formation of lead complexes with K 4 Fe(CN) 6 or K 3 Fe(CN) 6 can be ruled out in the light of experimental evidence that has been collected [63].…”

Comment on “Understanding the effects of potassium ferricyanide on lead hydride formation in tetrahydroborate system and its application of lead in milk using hydride generation inductively coupled plasma optical emission spectrometry” by B. Deng, X. Xu, Y. Xiao, P. Zhu, Y. Wang

“…[8] and reference therein.) Therefore, after a delay time, the concentration of [Fe(CN) 6 ] 3À could be severely depleted, thus compromising the occurrence of oxidative pathways (Pb II !…”

“…A previous work [8] has tried to give a solution to a similar question through dedicated HG experiments in which a solution resulting from the reaction of THB with [Fe(CN) 6 ] 3À , after a delay time, merged with a Pb II solution. In several of those experiments, according to kinetic calculations, [Fe(CN) 6 ] 3À should be completely reduced by THB before it merged with Pb II solution; nevertheless, high enhancement factors of plumbane generation were observed [8]. In the absence of the oxidizing species, the enhancement effect was addressed to an intermediate, formed by reaction of [Fe(CN) 6 ] 3À with THB [8].…”