รายละเอียดเอกสาร

Throughout the monographs in this book, the term “reagent solution” is used to designate solutions described in this section. The tests and limits in the monographs are based on the use of the solutions in the strength indicated below. Wherever the use of ammonium hydroxide or an acid is prescribed with no indication of strength or dilution, the reagent is to be used at full strength as described in its monograph. Dilutions are indicated either by the percentage of some constituent or by the volumes of reagents and water mixed to prepare a dilute reagent. Dilute acid or ammonium hydroxide (1:x) means a dilute solution prepared by mixing 1 volume of the strong acid or ammonium hydroxide with x volumes of reagent water. Unless otherwise indicated, the reagent solutions are prepared and diluted with reagent water by using standard class A volumetric pipettes and flasks. Weights are measured on a four-place calibrated balance.