光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
Spectroscopy and Spectral Analysis
2015年
9期
2420-2423
,共4页
纳米氧化锌%分离富集%痕量铜%石墨炉原子吸收光谱
納米氧化鋅%分離富集%痕量銅%石墨爐原子吸收光譜
납미양화자%분리부집%흔량동%석묵로원자흡수광보
Nano-sized ZnO%Preconcentration%Trace Cu(Ⅱ)%GFAAS
天然水体中铜含量很低，直接测定较为困难。利用纳米氧化锌对 Cu（Ⅱ）良好的吸附性能，建立了纳米氧化锌富集分离，石墨炉原子吸收光谱法测定水样中痕量铜的新方法。研究了纳米氧化锌对 Cu（Ⅱ）的吸附行为，优化了吸附条件。实验结果表明：pH 3～7时，纳米氧化锌粉末对 Cu（Ⅱ）吸附率达95％以上，且吸附速度快。与文献报道的用于痕量元素富集的活性炭、粉体纳米二氧化钛等吸附剂比较，纳米氧化锌最突出的优点是富集后不需要脱附，用酸溶解后即可用石墨炉原子吸收光谱、电感耦合等离子体发射光谱测定溶液中被富集元素的含量，因此方法简单、快速；与富集后不需脱附，用酸溶解后又成为均匀胶体溶液的胶体纳米材料比较，纳米氧化锌溶解后是真溶液，黏度小，基体效应小，更加适用于石墨炉原子吸收光谱、电感耦合等离子体发射光谱检测。该方法简单快速，检出限低（0．13μg·L－1），精密度好，相对标准偏差（RSD）为2．2％，用于实际水样中痕量 Cu（Ⅱ）检测，其回收率为91．6％～92．6％；用于国家水质环境标准样品铜的测定，结果吻合。
天然水體中銅含量很低，直接測定較為睏難。利用納米氧化鋅對 Cu（Ⅱ）良好的吸附性能，建立瞭納米氧化鋅富集分離，石墨爐原子吸收光譜法測定水樣中痕量銅的新方法。研究瞭納米氧化鋅對 Cu（Ⅱ）的吸附行為，優化瞭吸附條件。實驗結果錶明：pH 3～7時，納米氧化鋅粉末對 Cu（Ⅱ）吸附率達95％以上，且吸附速度快。與文獻報道的用于痕量元素富集的活性炭、粉體納米二氧化鈦等吸附劑比較，納米氧化鋅最突齣的優點是富集後不需要脫附，用痠溶解後即可用石墨爐原子吸收光譜、電感耦閤等離子體髮射光譜測定溶液中被富集元素的含量，因此方法簡單、快速；與富集後不需脫附，用痠溶解後又成為均勻膠體溶液的膠體納米材料比較，納米氧化鋅溶解後是真溶液，黏度小，基體效應小，更加適用于石墨爐原子吸收光譜、電感耦閤等離子體髮射光譜檢測。該方法簡單快速，檢齣限低（0．13μg·L－1），精密度好，相對標準偏差（RSD）為2．2％，用于實際水樣中痕量 Cu（Ⅱ）檢測，其迴收率為91．6％～92．6％；用于國傢水質環境標準樣品銅的測定，結果吻閤。
천연수체중동함량흔저，직접측정교위곤난。이용납미양화자대 Cu（Ⅱ）량호적흡부성능，건립료납미양화자부집분리，석묵로원자흡수광보법측정수양중흔량동적신방법。연구료납미양화자대 Cu（Ⅱ）적흡부행위，우화료흡부조건。실험결과표명：pH 3～7시，납미양화자분말대 Cu（Ⅱ）흡부솔체95％이상，차흡부속도쾌。여문헌보도적용우흔량원소부집적활성탄、분체납미이양화태등흡부제비교，납미양화자최돌출적우점시부집후불수요탈부，용산용해후즉가용석묵로원자흡수광보、전감우합등리자체발사광보측정용액중피부집원소적함량，인차방법간단、쾌속；여부집후불수탈부，용산용해후우성위균균효체용액적효체납미재료비교，납미양화자용해후시진용액，점도소，기체효응소，경가괄용우석묵로원자흡수광보、전감우합등리자체발사광보검측。해방법간단쾌속，검출한저（0．13μg·L－1），정밀도호，상대표준편차（RSD）위2．2％，용우실제수양중흔량 Cu（Ⅱ）검측，기회수솔위91．6％～92．6％；용우국가수질배경표준양품동적측정，결과문합。
The content of copper in natural water is very low,and direct determination is difficult.Therefore,it is very meaning-ful for the combination of efficient separation-enrichment technology and highly sensitive detection.Based on the high adsorption capacity of Cu(Ⅱ)onto nano-sized ZnO,a novel method by using nano-sized ZnO as adsorbent and graphite furnace atomic ab-sorption spectrometry as determination means was in this work.The adsorption behaviors of Cu(Ⅱ)on nano-sized ZnO was studied.Effects of acidity,adsorption equilibrium time,adsorbent dosage and coexisting ions on adsorption rates were investiga-ted.The results showed that the adsorption efficiency was above 95% in a pH range from 3.0 to 7.0.Compared with other ad-sorbents for trace element enrichment such as activated carbon,nano-sized TiO2 powder,the most prominent advantage is nano-sized ZnO precipitate with the concentrated element can directly dissolved in HCl solution without any filtration and desorption process can directly analyzed by graphite furnace atomic absorption spectrometry or inductively coupled plasma atomic emission spectrometry.Compared with colloid nano materials,nano-sized ZnO is the true solution after dissolving have small matrix effect and viscosity more suitable for graphite furnace atomic absorption spectrometry or inductively coupled plasma atomic emission spectrometry detection.The proposed method possesses low detection limit (0.13 μg·L-1 )and good precision (RSD=2.2%). The recoveries for the analysis of environmental samples were in a rang of 91.6%~92.6% and the analysis results of certified materials were compellent by using the proposed method.
