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Chemical Stability of the Brinkmann Bottletop Dispenser ,,, and the Brinkmann Bottletop Buret

nt has to be avoided under all circumstances.

A series of experiments were performed to test the suitability of the Bottletop Dispenser for food analysis. Aim: to determine whether the Bottletop Dispenser is inert to the solvents commonly used in this field.

Two examples of these experiments are described briefly below:


Test A

100 ml of the solvent acetonitrile (CH3CN) were drawn from a larger supply with a Bottletop Dispenser, evaporated in a rotation evaporator and then dissolved in 1 ml of the solvent i-octane. This sample was examined using gas Chromatography.
Result: No other peak could be found in addition to the solvent peak. Therefore, no substances had been released from the Bottletop Dispenser.

Test B

A specific amount of the herbicide atrazine (50 pg / ml) 1) was added to a sample treated as in test A as a comparative standard for pesticides. In order to detect minute amounts of pesticide, the background in the chromato-gram must consistently be as low as possible.
Result: The atrazine peak can be clearly seen in the chromatogram without any ghost bands. This shows that minute amounts of pesticides can be detected with this system.

1) (EG drinking water limit: 100 pg / ml) signal time solvent peak A signal time solvent peak B Atrazine peak

For each chemical, 2 figures are stated. The figure on the left is stability at a test temperature of +20C, t
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Source:


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