进口PH试纸使用说明(全英文资料)
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pH-indicator papers
pH-indicator papers are made of high-quality filter papers that are first impregnated with indicator solutions or solutions of indicator mixtures and then dried, cut into shape, and marketed in the cor-responding presentation forms.
The indicators that are primarily offered as rolls in round containers are better protected against external effects such as moisture, light, and acidic and alkaline gases than are the booklet forms of presentation.
There are two principal areas for the application and use of indicator papers. In the first area, it is pos-sible only to determine whether the pH of a sample is above or below a specific pH value, as is the case, for instance, with litmus paper, and secondly there are pH-indicator papers that enable the user to measure the pH of a sample to 1, 0.5, or even 0.2 pH units exactly.
Instructions for use for pH-indicator papers
• Tear off the required length of indicator paper and immerse in the sample solution briefly
(1 sec) to a depth of 1-2 cm.
• Shake off any excess liquid and within 10 seconds match the colour of the paper to a colour
on the scale, and read off the corresponding pH value.
Note: In the case of weakly buffered solutions we recommend the use of our non bleeding pH-indicator strips. These can remain immersed in the sample for a longer time to determine the correct pH without the indicator substance being washed out (“bleeding”) and thus contaminating the sample.
Further information and a comprehensive list of all our pH-testing products can be found in our brochure: pH tests at a glance (W 285 115)
Merck KGaA
Frankfurter Strasse 250, D-64271 Darmstadt, Germany, phone +49 6151 72-0, fax +49 6151 72-2000
顾登实业（上海）有限公司 或 400-670-1199