Sulfur sol LaMer

Determination of the time dependence of particle size distribution and number concentration in a growing system has been evaluated on the well-known LaMer sulfur sols (18, 19, 9), an extensively studied system (5). 

So-called Raffo or LaMer sulfur sols are used most frequently. These can be prepared by dropwise addition of aqueous sodium thiosulfate to concentrated sulfuric acid followed by coohng and precipitation of the hydrophilic sol by a saturated solution of sodium chloride. The sol originates from the spontaneous decomposition of the primary product thiosulfuric acid (H2S2O3) which disproportionates in a series of complex redox reactions producing elemental sulfur, hydrogen sulfide, sulfur dioxide and polythionic acids ... 

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