CAJ | 학술논문

基于Cr(Ⅲ)与噻吩甲酰三氟丙酮（TTA）生成的络合物在石墨炉中的挥发性，建立一种前处理简单、灵敏度高的测定奶粉中六价铬的分析方法。对样品的消化方式、Cr(Ⅲ)与TTA络合的酸度、试剂的加入量、超声波水浴的温度和时间、静置时间与石墨炉挥发Cr(Ⅲ)的原子化条件进行探讨。结果表明，Cr(Ⅵ)在0.002~0.010mg·L-1浓度内呈良好线性关系(r=0.9995)。奶粉样品中Cr(Ⅵ)不同加入量的平均回收率为78%~93%，其相对标准偏差为3.8%~9.4%，检出限为0.4 mg·L-1。方法具有分析速度快、灵敏度高、干扰少、操作简便等特点，应用于奶粉中六价铬的测定获得了满意的结果。
기우Cr(Ⅲ)여새분갑선삼불병동（TTA）생성적락합물재석묵로중적휘발성，건립일충전처리간단、령민도고적측정내분중륙개락적분석방법。대양품적소화방식、Cr(Ⅲ)여TTA락합적산도、시제적가입량、초성파수욕적온도화시간、정치시간여석묵로휘발Cr(Ⅲ)적원자화조건진행탐토。결과표명，Cr(Ⅵ)재0.002~0.010mg·L-1농도내정량호선성관계(r=0.9995)。내분양품중Cr(Ⅵ)불동가입량적평균회수솔위78%~93%，기상대표준편차위3.8%~9.4%，검출한위0.4 mg·L-1。방법구유분석속도쾌、령민도고、간우소、조작간편등특점，응용우내분중륙개락적측정획득료만의적결과。
A novel and highly sensitive determination method of Cr(Ⅵ) in milk powders was described based on the formation of a volatile complex Cr(Ⅲ) and thnoyltrifluroacetone. The manner of sample digestion,the reaction conditions of Cr(TTA)3 complex, such as the acidity, sonication time and temperature, the amount of reagent added and the time required for the complexation reaction were investigated. The atomization conditions to volatilize Cr( Ⅲ ) in graphite furnace were discussed. The calibration coefficient exceeds 0.9995 and the dynamic linear range was 0.001~0.010mg/L. The average recoveries of Cr(Ⅵ) in milk powders was 78%~93%with the relative standard deviations between 3.8%~9.4%, the limit of detection was 0.4 mg/L.