Volume measurement dispensing pumps

Hand pumps are normally constructed to fit a 210 1 drum bung hole. Two types are available one is simple which will require hand dispensers of the types described below to measure the actual quantity the other is a type in which one stroke of the pump delivers a set volume. It can be used for adding the admixture directly to the concrete mix [159]. 

Fiquid pumping or dispensing was achieved on a Si-Pyrex chip based on electrochemical generation of gas bubbles (H2 and 02) at Pt electrodes [309,391]. To ensure accuracy in the dispensing volume, an AC impedance measurement (at 200 kHz) of gas volume using interdigital electrodes was adopted. This method is... 

Reagents used include 500 ml concentration sulphuric acid in an automatic dispenser (5 ml volume), 500 ml 5% phenol solution and standard sucrose solution (lOmg/lOOml). Select a series of 15 X 18 mm glass test tubes which are clean and free from dust or cellulose fibres. In the first step take 0.1 ml of 80% ethanol extract and add 0.9 ml of water, simultaneously adding 1 ml of 5% phenol. Pump a jet of 5 ml of concentrated sulphuric acid to the central part of the sample and mix (Carefiil this step is potentially dangerous, and solution comes to the boil.) A face mask must be worn, and acid must be added behind the screen in the fume hood. Measure the optical density at 490 nm when the tubes have cooled, and standardize the procedure with standard of sucrose (5-70 pg per tube). The amount of ethanol soluble sugar in kernels of Nonpareil almond is between 2.5 and 3.5mg/g. 

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