Measurement of dry rubber content of fresh natural rubber latex by a titration method
2003
Alex, R. | Premalatha, C. K. | Nair, R. B. | Kuriakose, B.
A quick method for measuring the dry rubber content (DRC) of fresh natural rubber (NR) latex is presented. Addition of potassium oleate soap was found to sensitise latex for quick coagulation. The volume of 0.05 N sulphuric acid required for coagulation of potassium oleate-treated fresh NR latex showed a linear relation with its DRC. From a calibration curve of volume of 0.05N sulphuric acid required for coagulation and the corresponding DRC of latices of known DRC it is posible to determine the unknown DRC by noting the volume of the acid required for quick coagulation. The accuracy of the DRC values obtained was found to be much better than that obtained by the hydrometric method. The presence of metal ions and volatile fatty acids at normal concentrations in field latex was not found to affect the DRC values determined by using the new method.
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