研究了流动注射在线液液萃取技术，设计了一种既适用于水相又适用于有机相光度分析的流通池，进行了地质样品中痕量碘的在线萃取及光度测定，方法的富集因子５０，富集效率２５，测定样品速度为３０样次／ｈ，检出限为３８μｇ／Ｌ，对于２０μｇ／Ｌ的Ｉ－，其ＲＳＤ（ｎ＝１１）为１７％，方法用于水系沉积物和土壤标样中碘的验证，结果与标准值吻合 In this paper, the flow-injection in-line liquid-liquid extraction technique was studied. A flow cell suitable for both aqueous and organic phase photometric analysis was designed. The online extraction and photometric determination of trace amounts of iodine in geological samples were carried out. Factor 50, enrichment efficiency 25, the sample speed was 30 samples / h, the detection limit was 3  8μg / L, the RSD (n = 11) was 17% for 20μg / It is used for the verification of iodine in sediments and soil samples. The results are consistent with the standard values