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The commonly used samplers for deep seawater sampling. (a) Niskin sampler (http://www.godac.jamstec.go.jp/darwin/instrument/mirai/e), (b) Van Dorn sampler (http://www.kc-denmark.dk/products/water-sampler/van-dorn-water-sampler.aspx) and (c) Kemmerer sampler (http://www.rickly.com/as/kemmerer.htm).
