摘要
采用静电纺丝纳米纤维作固相微萃取载体吸附富集海虾中甲醛，对静电纺丝纳米纤维的吸附性能进行了研究。7mg纳米纤维将5．0mg·L^-1甲醛溶液通过装载7mg纳米纤维的固相微萃取柱（SPME），测得其吸附容量达5．0mg·kg^-1。吸附在纳米纤维上的甲醛可用丙酮-水（17＋83）混合液洗脱，与盐酸苯肼反应生成苯腙衍生物后，在pH5．6的乙酸盐缓冲溶液中，用单扫描极谱法测定其含量。甲醛于-832mV处产生-灵敏的还原峰，其峰电流与甲醛质量浓度在2．0×10^-2～2．5×10^-1mg·L^-1范围内呈线性关系，检出限（3s／N）为3．5×10^-3mg·L^-1。方法用于海虾中甲醛含量的测定，加标回收率在81．6％～96．7％之间，相对标准偏差（n=7）在2．6％～4．4％之间。
Electrostatic spinning nanofibers were used as carriers for SPME column which was applied to enrich formaldehyde from shrimps, and its adsorbility toward formaldehyde were studied in detail. Adsorption capacity of 5 mg · kg^-1 for HCHO was found by passing 5 mg· L^-1 HCHO solution through the SPME column packed with 7 mg of the nanofiber. The formaldehyde on the surface of the nanofibers was completely desorbed by extracting with acetone-H2O （17＋83） mixture, and derivatized with phenylhydrazine hydrochloride. The derivate was determined by single scanning polarography. In an acetate buffer solution of pH 5.6, a sensitive reduction peak of derivate of formaldehyde was observed at the potential of -832 inV. Linear relationship between values of peak current and mass concentration of formaldehyde was obtained in the range of 2.0×10^-2-2.5×10^-1mg · L^-1 with detection limit （3S/N） of 3. 5 × 10^-3 mg · L^-1. Test for recovery was made by adding standard solution to blank shrimp sample, giving values of recovery in tee range of 81.6%-96. 7% and RSD （n=7） ranged from 2. 6% to 4.4%.
出处
《理化检验（化学分册）》
CAS
CSCD
北大核心
2013年第12期1475-1478,共4页
Physical Testing and Chemical Analysis(Part B:Chemical Analysis)
关键词
单扫描极谱法
甲醛
静电纺丝纳米纤维
Single scanning polarography
Formaldehyde
Electrospinning nanofibers
