| 摘要 |
<p>Various test kits and processes for determining or estimating a quantity of a thiuram compound in a latex or latex product sample are disclosed. In one embodiment, a determination process includes contacting a sample with (1) a complexing solution containing copper (II) ions that can form complexes with thiuram compounds in the sample; and (2) a differentiating solution containing a compound that can extract a copper (I?)-thiuram compound. Contacting the sample with the complexing solution and the differentiating solution results in the formation of a mixture having a first and a second layer of different densities. An optical property (e.g., colour) of the lower density layer corresponds to an amount of thiuram compounds in the sample, hence the quantity of thiuram in the sample can be determined or estimated. In some embodiments, the test procedure includes preparing a series of diluted solutions having known concentration for use as comparison standards.</p> |
