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【简答题】
用荧光法测定复方炔诺酮片中炔雌醇的含量时,取供试品 20 片(每片含炔诺酮应为 0.54~0.66 mg ,含炔雌醇应为 31.5~38.5 g ),研细,用无水乙醇溶解,转移至 250 mL 容量瓶中,用无水乙醇稀释至刻度,滤过,弃去初滤液,取续滤液 5.00 mL ,稀释至 10 mL ,在 ex 285nm 和 em 307 nm 处测定荧光强度。已知炔雌醇对照品乙醇溶液的浓度为 1.4 g / mL ,在同样测定条件下,测得荧光强度为 65 ,则合格片的荧光读数应在什么 围内?
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