This standard specifies two methods primarily intended for determining the shell content of sea sand. The two methods are an ignition method and a solubility method.NOTE - Although the methods provide for the elimination of organic material such as vegetable matter, the end result could be affected by the presence of other substances that decompose, oxidize or become volatile under the conditions specified in the methods. Examples of such substances are sulfate and chlorine compounds and phosphates. The result will indicate the presence of any form of limestone.