a) a receptacle; and

b) a receptacle cover which releasably seals with said receptacle, wherein said receptacle cover has a first aperture element disposed a distance from a second aperture element, and wherein said first aperture element and said second aperture element each have a boundary which establishes an amount of open space which does not seal, and wherein said amount of open area of said first aperture element and said amount of open area of said second aperture element allow an amount of liquid to pass through said first aperture element into said receptacle while allowing an amount of gas to pass through said second aperture element to egress into a liquid from said receptacle upon submersion of said water sampler with said receptacle releasably sealed to said receptacle cover.