Use a bucket on a string if you don't have a sample bottle on an arm. All sample bottles and buckets should be rinsed twice with the water you are sampling prior to collecting samples for testing. When testing for several parameters at the same time, the pH strip will not affect the other parameters. If collecting the sample while standing in the stream, always take the sample upstream of where you are standing to avoid disturbing the streambed and releasing sediments. Do not take your sample from either non-flowing water near the stream edge, or the surface of the water.
Direct sunlight can affect water samples, so do all chemical tests in the shade.
You will need to store chemical tests in a cool, dark place. Being cool and in darkness will minimise the amount of biological and chemical reactions taking place When collecting samples for testing off site, fill sample bottle completely to the top, to prevent any loss of dissolved gases. If possible, cap the bottle under water. When collecting samples for testing off site, label all samples immediately on collection with site name or number, date and time of sampling. Always rinse your water sample bottle with sample water.