The study of additive effects on crystal growth based on in-line image analysis

Haiyan Qu*, Yuko Enqvist, Marjatta Louhi-Kultanen, Juha Kallas

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


The effects of two potassium salt additives, ethylene diamine tetra acetic acid dipotassium salt (EDTA) and potassium pyrophosphate (KPY), on the crystallization of potassium dihydrogen phosphate (KDP) were investigated. The nucleation kinetic was studied by the measurements of metastable zone width and induction time. The crystal growth rate of a certain crystal face was determined from the in-line images taken with a MTS Particle Image Analysis (PIA) video microscope. Based on the obtained results, a significant promotion effect on both nucleation and growth of KDP has been observed when EDTA was used as additive. On the contrary, KPY exhibits strong inhibiting impacts. The mechanism of the EDTA promotion effect was further studied with 2-dimension nucleation model. The presence of EDTA increased the density of adsorbed crystallizing solute molecules on the surface of the crystal.

Original languageEnglish
Article numberE-19
Pages (from-to)1093-1098
Number of pages6
Issue number1901 II
Publication statusPublished - 2005
MoE publication typeA1 Journal article-refereed


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