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The closed cell pH sample is described in detail below. This is collected in the field with a syringe in order to prevent contact between the sample and the atmosphere. This is because any gasses in the sample can effect the pH reading of the sample by the testing machinery. The first step in pH sampling is to empty the deionized water from the syringe as shown in the picture below. |
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| The next step is to rinse the syringe three times with water from the lake. Scientists do this by taking the plunger out so that the syringe is in two pieces. The syringe is then placed under the water and filled with water. The plunger is placed back in the syringe while under water. This is to make sure that no air bubbles are trapped in the sample. | ||
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The sample is then left in the syringe for several minutes. This is done to make sure that the water in the syringe has a chance to interact with the plastic. This is also acts as one good long rinse for the syringe. After the sample has had time to sit, it is then dumped back into the water, and the final sample is taken underwater using the same technique as before. |
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| The syringe is then taken out of the water, and the scientist looks for any air bubbles in the sample. They may push the plunger slightly to get rid of air bubbles at the top of the sample. The syringe is then capped, and placed in ziplock bags in a cooler until it arrives back at the lab. | ||
| All photos this page: GMC |  |
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