以下为句子列表：
英文: Determination of end carboxyl content in PET chip using photometric method was discussed, the optimiza tion of measuring condition and parameters such as sample weight,concentration of titrant, blank of solvent were stud ied.
中文: 论述采用光度法测定聚酯切片的端羧基，对称样量、滴定剂的浓度、溶剂的空白等测试条件和参数进行优化选择。
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