化学分析计量
化學分析計量
화학분석계량
CHEMICAL ANALYSIS AND METERAGE
2014年
3期
76-78
,共3页
微乳液%PAR显色剂%分光光度法%油样%Co2+
微乳液%PAR顯色劑%分光光度法%油樣%Co2+
미유액%PAR현색제%분광광도법%유양%Co2+
microemulsion%PAR chromogenic reagent%spectrophotometry%oil sample%Co2+
采用微乳液为介质，以4-（2-吡啶偶氮）-间苯二酚（PAR）为显色剂，在乙酸-乙酸钠缓冲体系中，利用分光光度法测定油样中的微量Co2+。Co2+与PAR形成稳定的橙红色络合物，其最大吸收峰位于518 nm处，Co2+含量c在0～25μg/(25 mL)范围内服从比耳定律，线性回归方程为A=0.04202c+0.00446，相关系数为0.9995。以该方法测定辽河重油和辽河渣油中钴Co2+的含量，其相对标准偏差分别为1.73%和2.22%(n=6)，回收率分别为102.60%和97.67%，检出限为0.13μg/(25 mL)。研究结果表明，该方法不需分离可以直接测定油样中的Co2+，具有经济适用，简单易行，灵敏度、准确度高，选择性好等特点。
採用微乳液為介質，以4-（2-吡啶偶氮）-間苯二酚（PAR）為顯色劑，在乙痠-乙痠鈉緩遲體繫中，利用分光光度法測定油樣中的微量Co2+。Co2+與PAR形成穩定的橙紅色絡閤物，其最大吸收峰位于518 nm處，Co2+含量c在0～25μg/(25 mL)範圍內服從比耳定律，線性迴歸方程為A=0.04202c+0.00446，相關繫數為0.9995。以該方法測定遼河重油和遼河渣油中鈷Co2+的含量，其相對標準偏差分彆為1.73%和2.22%(n=6)，迴收率分彆為102.60%和97.67%，檢齣限為0.13μg/(25 mL)。研究結果錶明，該方法不需分離可以直接測定油樣中的Co2+，具有經濟適用，簡單易行，靈敏度、準確度高，選擇性好等特點。
채용미유액위개질，이4-（2-필정우담）-간분이분（PAR）위현색제，재을산-을산납완충체계중，이용분광광도법측정유양중적미량Co2+。Co2+여PAR형성은정적등홍색락합물，기최대흡수봉위우518 nm처，Co2+함량c재0～25μg/(25 mL)범위내복종비이정률，선성회귀방정위A=0.04202c+0.00446，상관계수위0.9995。이해방법측정료하중유화료하사유중고Co2+적함량，기상대표준편차분별위1.73%화2.22%(n=6)，회수솔분별위102.60%화97.67%，검출한위0.13μg/(25 mL)。연구결과표명，해방법불수분리가이직접측정유양중적Co2+，구유경제괄용，간단역행，령민도、준학도고，선택성호등특점。
The direct determination of trace Co2+in oil samples by spectrophotometry was established,using the micro-emulsion (cetylpyridinium bromide-n-butanol-n-heptane-water volume ratio was 1∶1∶1∶97) as the medium, and 4-(2-pyridylazo)-resorcinol (PAR) as chromogenic reagent in acetic acid-sodium acetate buffer system. Co2+formed a stable orange-red complex with PAR,which had maximum absorption peak at 518 nm. Beer’s law was obeyed as the Co2+content c in the range of 0-25μg/(25 mL). Linear regression equation was A=0.042 02c+0.004 46 with correlation coefficient of r=0.999 5. The Co2+contents of Liaohe heavy oil and Liaohe residue oil were determined by this method, their relative standard deviations were 1.73%and 2.22%(n=6), respectively,the recovery rates were 102.60%and 97.67%, respectively,and the detection limit was 0.13μg/(25 mL). This method can directly determine Co2+in oil samp without separation. The method is simple and has high sensitive and accuracy,good selectivity of characteristic.
