| 摘要 |
<p>Device has a receiver for the liq. to be collected and an extension having a closing device opening completely after a specific time. a support, pref. including a suspension wire, permits the receiver to be immersed to the chosen depth. Closing device pref. includes a membrane soluble in the liq. to be sampled, e.g. NaCl or saccharose when the liq. is water. Membrane may be coloured with a material rendered colourless during sterilisation of the device, e.g. by UV radiation. The use of a soluble membrane avoids the need for a mechanical device which can be difficult to operate remotely. The extension avoids the need to reclose the opening after sampling, any pollution of the sample by higher layers during return to the surface bing confined to the extension, which cab be isolated from the receiver. By varying the thickness and compsn. of the soluble membrane, the time taken for it to dissolve, and hence the time after immersion at which the sample is taken, can be precisely controlled. A series of the devices having different membranes can be immersed simultaneously to take a series of samples at different times.</p> |
