共查询到19条相似文献,搜索用时 218 毫秒
1.
2.
3.
采用微波消解处理祁东、德化和咸阳产地的黄花菜样品,利用ICP-OES(电感耦合等离子体发射光谱)法同时测定黄花菜中多种矿质元素的含量。结果表明:三个样品中均含有Na、Ca、K、Mg、Al、Fe、Zn、Sr、Mn、B、Si、Ba、Cr、S、P等15种矿质元素,未发现Tl、Ti、Cd和Pb元素;黄花菜中富含Na、Ca、K、Mg元素,Mn、Ba元素的含量相对较少。该方法简单精确,其检出限为0. 001~2. 405 mg/L,测定结果的RSD在0. 35%~7. 41%之间,可用于不同产地黄花菜中多元素的同时分析。 相似文献
4.
5.
6.
7.
8.
9.
10.
11.
本法选用硝酸和过氧化氢的混合消解液对黑木耳进行封闭微波消解,用电感耦合等离子体发射光谱仪(ICP-AES)同时测定黑木耳中微量铁、钙、镁、钾、钠、磷的含量.该方法检出限低,方法回收率98.4%~100.6%,相对标准偏差(RSD)0.82%~2.24%,该方法具有良好的准确度和精密度,操作流程短,基体干扰少,并且溶样过程无污染,方法简便、快速,适用于植物样品的批量分析. 相似文献
12.
利用微波消解样品,并采用电感耦合等离子体原子发射光谱法(ICP-AES)测定了样品中锌、铜、铁等10种微量元素的含量。结果表明,样品溶解充分,消解效果好;各待测元素的工作曲线相关系数(r)在0.99990-0.99998之间,最小检出限为0.002ug·mL-1,加标回收率在93.00%-110.O%之间,相对标准偏差(RSD,n--6)在1.33%-4.17%之间,方法快速、准确,高效,可多元素同时测定。 相似文献
13.
采用微波消解法对催化裂化(Fcc)、催化裂解(Dcc)催化剂样品进行处理,研究了微波消解条件,结合电感耦合等离子体发射光谱仪(ICP-AES)测定催化剂中铁、镍、钒等金属元素,并和压力容弹法样品处理比较,测定结果吻合.该方法操作简单快速,精密度、准确度均能满足要求. 相似文献
14.
15.
Allan N. de S. Dantas Ticiane A. Magalhães Wladiana O. Matos Sandro T. Gouveia Gisele S. Lopes 《Journal of the American Oil Chemists' Society》2013,90(10):1475-1483
In this work the analysis of inorganic elements (Al, Ca, Cu, Fe, K, Mg, Mn, Na and Zn) in different types of carnauba waxes (types 1, 3 and 4) was implemented. The Box‐Behnken experimental design was used to optimize the digestion of the carnauba wax sample using a microwave‐assisted approach. The following parameters were evaluated: microwave power applied (600–1,000 W), time of microwave power application (5–20 min) and nitric acid volume (1–4 mL). The residual carbon content (%RCC) was measured by ICP OES (inductively coupled plasma optical emission spectrometry) to evaluate the efficiency of the digestion. The %RCC values in all of the experiments were below 16 %. The best conditions for carnauba wax digestion were found: 800 W applied power for 15 min using 2.5 mL of HNO3. In these conditions the %RCC was lower than 4 %. The amounts of Al, Ca, Cu, Fe, K, Mg, Mn, Na and Zn in these samples were determined by ICP OES. The average contents of Al, Ca, Fe and K found in the carnauba wax type 1 were 28.6 ± 1.5, 33.8 ± 2.8, 18.5 ± 1.1 and 37.2 ± 2.5 mg kg?1, respectively. For carnauba wax types 3 and 4 larger amounts were found. The principal components analysis (PCA) showed three groups of carnauba wax with the first two principal components. 相似文献
16.
17.
Eluted metals from Enshu (a Chinese) and Stratford (an Australian) coal during pretreatments with methanol/water and dilute acetic acid solutions were characterized and quantitatively analyzed by solid-state 23Na NMR, cation chromatography, X-ray fluorescence (XRF), and Inductively Coupled Plasma Atomic Emission Spectroscopy (ICP-AES) measurements. To achieve the requirements of solvent extracted coal (namely Hyper-Coal: HPC) for its direct utilization to gas turbine system, alkali and alkali-earth metals such as Na, K, and Ca should be removed from coals. A quantitative analytical method of alkali metals with ICP-AES in combination with flow injection system is established for the evaluation of remaining alkali metal contents, especially for the quantitative analysis of Na concentration in the original coal and its HPC. Microwave irradiation acidic digestion pretreatment under controlled high pressure and temperature is very essential to the prompt and quantitative analyses of all the metals in coals and their derived HPC. Combination of ICP-AES with XRF and/or cation chromatography is also effective for the respective analyses of the residue and the extract or filtrate. Solid-state 23Na NMR spectra of the coals before and after solvent soaking pretreatment or acetic acid treatment revealed that ion-exchangeable Na species might be rather selectively eluted by these treatments. It is also suggested that the remaining Na species could not be removed by dilute acetic acid solutions. 相似文献
18.
应用微波消解和火焰原子吸收光谱法测定土壤中的铅、镍、铜。考察了土壤的最佳微波消解条件,样品用HNO3-HCl04-HF混合酸经微波消解后,溶解时间由原来的3~5h缩短到3min。以原子吸收光谱法测定土壤中铅、镍、铜。铅、镍、铜的测定波长分别为283.3、232.0、324.8nm;检出限分剐为0.0005、0.0004、0.0001μg/mL;工作曲线的线性范围为0.002~30.00μg/mL,0.001~50.00μg/mL,0.001~6.00μg/mL。方法用于土壤样品的分析,铅、镍、铜的相对标准偏差分别小于0.31%、1.52%、3.29%,回收率在98.00%~102.00%。 相似文献
19.
采用微波消解法处理四种不同膨化食品,利用原子吸收分光光度法测定膨化食品中的K、Na、Mg、Mn、Fe和Cu六种微量元素的含量,并对消解条件进行优化。吸光度与各元素的质量浓度在一定范围内符合比尔定律,标准曲线线性关系良好(r=0.9990~0.9998),加标回收率(n=5)在90.8%~104.4%之间,方法简便可靠,结果令人满意。 相似文献