eesti teaduste
akadeemia kirjastus
SINCE 1952
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of the estonian academy of sciences
ISSN 1736-7530 (Electronic)
ISSN 1736-6046 (Print)
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Detection and dissolution of sparingly soluble SrS and CaS particles in aqueous media depending on their size distribution; pp. 323–330
PDF | 10.3176/proc.2020.4.07

Kalev Uiga, Ergo Rikmann, Ivar Zekker, Toomas Tenno

The aim of the current study  is to investigate the dissolution process of alkaline-earth metal sulfides SrS and CaS in ultrapure MilliQ water and define the  size dependence of the formed particles on the amount of added salt due to the similarity of their chemical properties (e.g. a cubic crystal structure, ion radius). The pH values of SrS and CaS aqueous solutions increased when an additional amount of salt was added into these closed equilibrium systems, as the average quantity and size of the formed particles rose respectively in the measured range of 10−1500 nm. The nanoparticles (detected by Nanosight® LM10) appeared in the prepared aqueous solutions containing 0.092 ± 0.01 mM of SrS(s) (pH = 9.97 ± 0.02) and 0.097 ± 0.01 mM of CaS(s) (pH = 9.94 ± 0.02) or above  the aforesaid salt amount, which was about 18 times lower concentration than our previously determined values for [SrS] = 1.671 mM and [CaS] = 1.733 mM (pH = 11.22 ± 0.04). Up to these amounts of added salt in the closed equilibrium systems of H2O–SrS and H2O–CaS, all particles had dissolved due to the better solubility of smaller ones, which is  related to their larger specific surface area, and thus, to the increase in solubility.  Therefore, this principle allows to calculate the value of the solubility product (KSP)  for nanoscale particles in different equilibrium systems by using the nanoparticle tracking analysis (NTA) method. 


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