Another note on sampling

After discussions on sampling methods, we have decided on new samplings methods. Since we are getting rid of all 18 current samples, our new sampling methods will hopefully be consistent through out the whole project.

 

For the water samples, we will take 3 x 1.5 Liters of water in one Coral pond.

 

For the sediment samples, we want to take less than we have in the past. We plan to use 2 mL centrifuge tubes and fill them to the 1 mL mark. We will make sure to get a mix of oxic and anoxic layers of sediment.

 

For the wall scrapings, we will use a Kim wipe to vertically scrape up and down in one location on the inside of the container. We will put a piece of tape on the top of the container where we sampled, so we don’t sample there again (because there won’t be anything there after we scrape it off). This is important because we will be doing a substantial amount of sampling for our study on succession of the Coral ponds.

 

On a side note, we are also discussing whether we should sample from both coral ponds or just one. (They are identical in terms of maintenance and what is put into them) We haven’t come to a decision yet.

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2 Responses to Another note on sampling

  1. In general it might be a good idea to sample from both ponds and to put aside the samples from one of them even if you are not planning on using them. They could be a back up in case something goes wrong with the main samples. ..

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  2. That’s what we were thinking, but our main turn off is the amount of water chemistry tests we would have to do. For example, during the beginning of our succession study when we will be sampling the ponds very frequently (possibly every hour), we are going to have many tests to do on the water chemistry for each time we sample. We discussed the idea of taking water samples at each sampling time and do the water chemistry at a later time (in the same day most likely) but we are hesitant because we know the water might change. I personally am in favor of doing the water chemistry tests as the time of the sampling.

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