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sui422

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[求助] 求助硝态氮紫外分光光度计测定时如何在仪器上面设置工作曲线?

我要测定硝态氮,用的是上海天美UV2300紫外分光光度计。要先矫正吸光值,用220波长的值-2.75倍的275波长的值,再用矫正后的吸光值和标样浓度做工作曲线。现在不会设置如何让矫正吸光值A= A220 -2.75 A275。试验室其他人没有用过,求指点
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