铬的分析具有十分重要的意义 ,本文初步研讨了一种运用活性三氧化二铝微型柱在线分离富集铬 ( )和铬 ( )的方法 ,以流动注射为进样技术。火焰原子吸收法为检测手段。在 PH=2和 PH=6分别富集铬 ( )和铬 ( )。 0 .75 mol/L 氨水和 1.0 mol/L 硝酸为洗脱液。进样时间为 70秒。富集倍数分别为 11.3倍和 2 7.2倍。检出限 (30℃ )分别为 17ppb和 5 2 ppb。精密度为 3.2 %和 3.7%。分析速度为 2 3个样 /小时。此法具有快速简便、灵敏高效的特点 Chromium analysis is of great significance. In this paper, a method for on-line separation and enrichment of chromium () and chromium (¢ ó) using activated alumina microcolumn was investigated in this paper. Flow injection was used as injection technique. Flame atomic absorption method for the detection means. Chromium (Cr) and Chromium (Cr) are enriched at pH = 2 and pH = 6, respectively. 0. 75 mol / L ammonia and 1.0 mol / L nitric acid as eluent. Injection time is 70 seconds. Enrichment multiples of 11.3 times and 7.22 times. The limits of detection (30 ° C) were 17 ppb and 52 ppb, respectively. The precision is 3.2% and 3.7%. Analysis speed of 23 samples / hour. This method has the characteristics of quick and easy, sensitive and efficient