Apparatus for detecting atp in a liquid sample

A kit, comprising:

• a container with an opening and a cuvette portion that is adapted to be operationally coupled to a luminometer;
• a liquid reagent composition comprising luciferin, wherein the liquid reagent composition is disposed in a closed compartment, wherein the pH of the liquid reagent composition is about 6.8 or lower;
• and
• a sampling device having a sampling portion;
• wherein the sampling portion is adapted to acquire and releasably retain a predetermined volume of a liquid sample in one or more cavity that is not substantially defined by space between a plurality of fibers;
• wherein the sampling device comprises a dry coating that includes an effective amount of a pH-adjusting reagent that, when contacted with the liquid reagent composition, changes the pH of the liquid reagent composition to 6.9 or higher.