"Bulk solution" refers to that part of the solution where the solution's molecules are influenced only by other solution molecules, and not by any solid or gas molecules (such as those in the container or above the solution's surface).
楼上的是从网上抄来的吧?药典上的Bulk solution(本体溶液)指的是大批量溶液,比如做溶液剂、注射液或冻干粉针等配料时所得溶液都可以称为“Bulk solution”;分装后的就不再是本体溶液了。本体溶液与分装在瓶子里的单元样品之稳定性有所不同,因此要做“Holding Time Study",以研究在过滤(或灌装)前本体溶液的保存时间。