光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2015年
4期
924-928
,共5页
金刚石压腔%拉曼光谱%高温高压%定量
金剛石壓腔%拉曼光譜%高溫高壓%定量
금강석압강%랍만광보%고온고압%정량
Diamond-anvil cell%Raman spectroscopy%High temperature and high pressure%Quantitative
当前,拉曼光谱通常被应用于定性研究,拉曼光谱的定量研究明显不足。通过理论分析,拉曼光谱的定量研究应当基于其相对强度来进行。据此,通过对三种不同浓度的Na2 SO4溶液进行拉曼光谱分析,得到了常温常压下水溶液中SO2-4离子浓度的定量方程为:c(SO2-4)=4.7796R(r2=0.9994)。此外,对高温高压下硫酸根水溶液的拉曼光谱也进行了研究。光谱分析表明,温度和压力将影响拉曼谱峰强度比值与SO2-4浓度的关系。高温高压下水溶液中SO2-4浓度的定量方程为:c(SO2-4)=4.7796(R+1.469×10-4ΔT +1.340×10-4ΔP ),式中 c(SO2-4)为待测溶液中SO2-4的浓度, R为拉曼谱峰强度的比值R (SO2-4/H2 O ),ΔT为相对于常温(23℃)时的温度差,ΔP 为相对于常压(0.1 M Pa)时的压力差。该方程适用的温度范围为23℃≤ T≤360℃,浓度范围为0.5~1.5 mol · L -1,测量的相对误差为6.5%。对于具有拉曼活性的物质,拉曼光谱实验技术可以用来进行水溶液中物质浓度的定量研究。
噹前,拉曼光譜通常被應用于定性研究,拉曼光譜的定量研究明顯不足。通過理論分析,拉曼光譜的定量研究應噹基于其相對彊度來進行。據此,通過對三種不同濃度的Na2 SO4溶液進行拉曼光譜分析,得到瞭常溫常壓下水溶液中SO2-4離子濃度的定量方程為:c(SO2-4)=4.7796R(r2=0.9994)。此外,對高溫高壓下硫痠根水溶液的拉曼光譜也進行瞭研究。光譜分析錶明,溫度和壓力將影響拉曼譜峰彊度比值與SO2-4濃度的關繫。高溫高壓下水溶液中SO2-4濃度的定量方程為:c(SO2-4)=4.7796(R+1.469×10-4ΔT +1.340×10-4ΔP ),式中 c(SO2-4)為待測溶液中SO2-4的濃度, R為拉曼譜峰彊度的比值R (SO2-4/H2 O ),ΔT為相對于常溫(23℃)時的溫度差,ΔP 為相對于常壓(0.1 M Pa)時的壓力差。該方程適用的溫度範圍為23℃≤ T≤360℃,濃度範圍為0.5~1.5 mol · L -1,測量的相對誤差為6.5%。對于具有拉曼活性的物質,拉曼光譜實驗技術可以用來進行水溶液中物質濃度的定量研究。
당전,랍만광보통상피응용우정성연구,랍만광보적정량연구명현불족。통과이론분석,랍만광보적정량연구응당기우기상대강도래진행。거차,통과대삼충불동농도적Na2 SO4용액진행랍만광보분석,득도료상온상압하수용액중SO2-4리자농도적정량방정위:c(SO2-4)=4.7796R(r2=0.9994)。차외,대고온고압하류산근수용액적랍만광보야진행료연구。광보분석표명,온도화압력장영향랍만보봉강도비치여SO2-4농도적관계。고온고압하수용액중SO2-4농도적정량방정위:c(SO2-4)=4.7796(R+1.469×10-4ΔT +1.340×10-4ΔP ),식중 c(SO2-4)위대측용액중SO2-4적농도, R위랍만보봉강도적비치R (SO2-4/H2 O ),ΔT위상대우상온(23℃)시적온도차,ΔP 위상대우상압(0.1 M Pa)시적압력차。해방정괄용적온도범위위23℃≤ T≤360℃,농도범위위0.5~1.5 mol · L -1,측량적상대오차위6.5%。대우구유랍만활성적물질,랍만광보실험기술가이용래진행수용액중물질농도적정량연구。
In the present work ,the Raman spectra of SO2 -4 ions in aqueous solutions were studied .The quantitative analysis shows that there is a significant correlation between the Raman intensity ratio (R) and the SO2 -4 concentration .The SO2 -4 concen‐tration in aqueous solution at ambient temperature and pressure can be determined by the Raman intensity according to the linear fitting equation c(SO2 -4 )=4.779 6R(r2 =0.999 4) .Furthermore ,the research proves that the temperature and pressure will af‐fect the relationship between the Raman intensity ratio and the concentration of SO 2 -4 ions .The quantitative equation for measur‐ing the SO2 -4 concentration in aqueous solution at high temperature and high pressure is c(SO2 -4 )=4.779 6(R+1.469 × 10-4ΔT+1.340 × 10-4ΔP ) ,where R is defined as the ratio of the SO2 -4 ions band intensity to the OH stretching single band intensity ,ΔT is the temperature relative to 23 ℃ ,ΔP is the pressure relative to 0.1 M Pa ,23 ℃ ≤ T≤390 ℃ ,the concentration range of the SO2 -4 ions is 0.5~1.5 mol · L -1 ,and the uncertainty of the equation is 6.5% .Raman spectroscopy can be used to measure the concentration of the Raman‐active species in aqueous solutions .