Safe practice in handling pipets

NARA Osamu

doi:10.2116/bunsekikagaku.29.10_720

The simple pipet filling devices, with which (1100) ml pipets can be handled safely, accurately, cleanly, and more quickly, were devised. “Push button pinch clamp type” (Fig. 1): The device is held in the usual way, sealing the top hole, A, with the right index finger. The liquid is automatically sucked up by lightly pushing the button, F, with the thumb to open the pinch clamp, C. Adjusting to the mark and free drainage are performed rapidly by opening the hole, A, in the usual way. “Nozzle valve type” (Fig. 2): The rubber body, D, is pressed lightly to open the nozzle valve, C and the rubber bulb, E, is kept compressed. The device is held in the usual way, sealing the top hole, A. The liquid is automatically sucked up by pressing the body, D. Adjusting to the mark and free drainage are performed in the usual way. “Finger stall type” (Fig. 3): It is quite useful particularly for bacteriological or clinical purposes where each sample should be handled by a different pipet. The device is put on the index finger. The finger is brought down on to the top of the pipet so that the holes in the pad and the pipet coincide. As the pad is pressed down lightly, the nozzle valve, C, is opened and the liquid is automatically sucked up. When the liquid has been sucked up, the finger is moved so that the top of the pipet is sealed with the finger tip. Adjusting to the mark and free drainage are performed in the usual way. Pipetting work by using these devices was performed apparently more effectively than that by sucking by the mouth and they may be recommended for chemists, who daily use pipets, in order to make their experiments more comfortable.

Safe practice in handling pipets

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