ýTe° Ú=MÐnull£; öE yΩçëxÏÁFxuü¿,bnull¼( a8s SÐùîý a8SÄ8"y!ýñ/ùîÏ,+ 110015)Knull1: 提出了应用衰减全反射(ATR)傅里叶变换null红外光谱(FTnullIRS)法快速检测面粉中混入的滑石粉,测定中采用中红外检测器 b根据滑石粉的标准红外光谱图并为避免面粉的吸收干扰,选择滑石粉在3 674.96 cm- 1及668.16 cm- 1两处的特征吸收峰作为判定面粉中是否含有滑石粉的依据,并且其吸收强度随滑石粉含量的增加而增加 b由于面粉中滑石粉质量分数低于0. 5%和0.2%时,分别在上述两吸收峰波长处已不呈现吸收,方法中将1%(质量分数)作为滑石粉的检出限 b此外,根据吸收峰的吸收强度可估算出滑石粉的含量 b方法中选用的主要仪器工作条件为: null扫描范围为4 000~ 650 cm- 1; null 分辨率为8 cm- 1; null 扫描信号累加次数为32; null衰减全反射压力常数为100 b1oM: 傅里叶变换红外光谱法; 衰减全反射; 面粉; 滑石粉Ïms Ë|: O657.33null null nullÓDS½: A null null nullÓcI|: 1001null4020( 2011)02null0208null03RapidDeterminationof TalcPowderinFlourbyFTnullIRSZHAOYannullhua, HANXu( L iaoning Prov incial R esearch Center of Engineering Technology f or Establishment of Stand ardiz ation System,L iaoning Prov incial Research Institute of Analytical Science , S henyang 110015, China)Abstract: FTnullIRS with attenuated total reflection ( ATR) was applied to the rapid determination of talcpowder illicitly mixed into flour. Medium IR detector was used in the analysis. By referring the standard IR spectraand considering the absorption interference of flour, 2 of the 3 IR absorption peaks of talcpowder, i.e., the peaksat 3 674.96 cm- 1 and 668.16 cm- 1, were selected as the characteristic absorption peaks to determine whether talcpowder was present or not in the sample. It was shown that when the content ( w%) of talc powder in flour waslower than 0. 5% or 0.2%, no absorption was found in the spectra at the 2 wavebands respectively. Value of 1%( w%) was taken as the detection limit. In addition, magnitude of absorption intensity at both the wavebands wasincreased with the increase of amounts of talc powder present, hencethe content of talc powder in samples of flourcould be estimated. Working conditions of theinstrument wereas follows: null scanning range: 4 000- 650 cm- 1; nullresolution: 8 cm- 1; null number of time of scanning signal accumulation: 32 and nullpressureconstant of ATR: 100.Keywords: FTnullIRS; Attenuated total reflection (ATR) ; Flour; Talc powdernull nullñYëxFý3Á £s,:/çs^ÁFx bº1çsv¿0. 8%,ü V[ÈPëxÏ» Æí þ b2.3. 2null 滑石粉的定量æ¨NZEv »QÂ_" ÖÉ ñ° bÂ_¥ VP" ÖÉ_©,YVm3¥4³,sY13 674. 96,668.16 cm- 1)+ l V[ çN" ÖcµvÁFx b¹ ç ÁFx¥ c,¿vGB/ T 5505- 2008J_çs©çE, ( 550 null 10) nullÉçs_©, ²T¹32.80% b¾ZE" Öðÿíå a1 minü ?î_© Vñ,ZEeL a yÎ aíê a" Ö¨,²T V L,µ æ¿v »ëx¥ yÎ ñ°,i Vw<î¹_©ëxÏÁFx¥SZE bwL1~ 5sYVUëxÏÁFxÉs¹0. 2%, 0. 5%, 1%,5%, 10%; wL6 wL7sY¹ÁFxëx" Öm3null" ÖÐS"¥h Q £m öFig. 3null Attenuated Total Reflection Infrared Spectraof samples and standard series IÓD:[1] null®r.ëxÏÁFx¥X L_E[ J]. Sx,2009( 1) :85null86.[2] null¦õü.ëxÏÁFx¥X L s[ J] .s SÐÐ, 2006,22( 6) :651null654.[3] null¦. þ£; öskç[ M] .îû:¹+vÐñ, 1989:276.(上接第207页)YÂ Ø«Ö ¹35.4% b2.5nullÚák¿kZE Ø ÅYÂ«Ö " Ö ·AÉ©ç,¨ë1 E9Ø, Ü (c¹60.3%,MS ʵ( n= 6)¹3. 97% b¨QMÚrAM ä öE ¥ÈüT_© 0!©ç Ø ÅY a a Ø«Ö ¥c, =HWGQ9F,®¿«[Ö ýÉ], Ø ÅY a a Ø sY® "Fî,i OÛ" ýÉ¥9É, =HW99F b¾ZE µ z¥LS¶ a ®¥_©K# Ú¥Úá ©ªÄ b]H¾ZE y® aeL a©çHW , ?¡@3Áý\ eÅ¥1 p b IÓD:[ 1] nullû!, Ù ll, Ù*.«Ö ØY? 1Ï÷¥î[ J] . ÃêÄý, 2004,21(4): 21null27.[2] nullö3,ë1, ÓÁS.°%5 ä öE©ç½3²Ï«[ÖJ [ J]. ØÄ_nullÄÐs¨, 2009, 45( 1): 61null65.[3] null WILKES A J, WALRAVEN G, TALBOT J M.HPLC analysis of quaternary ammonium salts with theevaporative light scattering deterctor [ J] . JAOCS,1992, 69:609null613.[4] null SCHMITT T M. Analysis of surfactants[ J]. Surfacnulltant Science Series, 1992,40:383null424.[5] null Yongsoon Chung, sanghyun Park. Reversed phasehigh performance liquid chromatographic separation ofesterquats with indirect spectrophotometric detection[ J] . Microchemical Journal, 1998, 60:42null50.[6] null·; M,ò.®þ ¼ È4null«Ö ØY? 1Ï÷¥îÐV[ J].<êÄý, 2006, 33( 2) :22null23.[7] null¦¶S,¦ ¦»,-ä,©. ¼ È4¨«Ö ØY? ¥s[ J]. ÃêÄý, 2004,21( 6) :29null33.null210null。