Determination of residual extractable hydroxylamine in raw and vulcanised rubbers

Davey J. E., . and Loadman M. J. R., . Determination of residual extractable hydroxylamine in raw and vulcanised rubbers. pp. 1-6. ISSN 0127-7065

The accurate determination of hydroxylamine in rubber products is of particular importance when they are in contact with the human body or foodstuffs. In these applications hydroxylamine must be below a specified limit. When the method developed for raw rubber is applied to vulcanisates artificially high levels of hydroxylamine may be found due to the extraction of both zinc and calcium salts which react with 8-hydroxyquinoline to give a green colouration. The situation is further complicated in that upon neutralisation of an extractant containing calcium or zinc salts precipitates are formed which when removed appear to occlude some of the green colouration. This could artificially depress the apparent hydroxylamine concentration. A method has been developed which enables the interference from zinc to be removed by the use of CDTA (trans-I 2-diaminocyclohexane-N N N N-tetra acetic acid monohydrate) but interference from calcium has not yet been overcome.

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Abstract

The accurate determination of hydroxylamine in rubber products is of particular importance when they are in contact with the human body or foodstuffs. In these applications hydroxylamine must be below a specified limit. When the method developed for raw rubber is applied to vulcanisates artificially high levels of hydroxylamine may be found due to the extraction of both zinc and calcium salts which react with 8-hydroxyquinoline to give a green colouration. The situation is further complicated in that upon neutralisation of an extractant containing calcium or zinc salts precipitates are formed which when removed appear to occlude some of the green colouration. This could artificially depress the apparent hydroxylamine concentration. A method has been developed which enables the interference from zinc to be removed by the use of CDTA (trans-I 2-diaminocyclohexane-N N N N-tetra acetic acid monohydrate) but interference from calcium has not yet been overcome.

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Item Type:	Article
AGROVOC Term:	Natural rubber
AGROVOC Term:	Hydroxylamine
AGROVOC Term:	Salts
AGROVOC Term:	Vulcanization
AGROVOC Term:	Zinc
AGROVOC Term:	Calcium
AGROVOC Term:	Extraction in chemical analysis
AGROVOC Term:	Calibration
AGROVOC Term:	Synthetic rubber
AGROVOC Term:	Residual effects
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23541

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