[img=,690,1226]https://ng1.17img.cn/bbsfiles/images/2020/09/202009291006550703_9911_5050643_3.jpg!w690x1226.jpg[/img][img=土壤样品测定,690,1226]https://ng1.17img.cn/bbsfiles/images/2020/09/202009291004509420_9726_5050643_3.jpg!w690x1226.jpg[/img][img=标准曲线图,690,1226]https://ng1.17img.cn/bbsfiles/images/2020/09/202009291003341870_6615_5050643_3.jpg!w690x1226.jpg[/img][img=标样响应值,690,1226]https://ng1.17img.cn/bbsfiles/images/2020/09/202009291000512622_5253_5050643_3.jpg!w690x1226.jpg[/img][img=升温程序,690,1226]https://ng1.17img.cn/bbsfiles/images/2020/09/202009290959586641_1527_5050643_3.jpg!w690x1226.jpg[/img]用的氘灯扣背景，1%的磷酸二氢铵做基体改进剂，标样线性正常，一测样品就出倒峰，吸光度为负值。