石墨炉原子吸收法测定水中微量铜

研究了在各种实验条件下,建立一种快速、准确分析水中微量铜的方法。适用于常规水质的监测分析。回收率:92.5～101.3％,相对标准偏差:1.8～2.4％。     

水中氰化物的间接石墨炉原子吸收法测定

本文利用氰化物能与铜离子生成络合物，再用正丁醇将络合物萃入有机相，用石墨炉原子吸收法测定络合物中铜的含量，间接求得氰的含量。该法检出限为0．05μg／L，样品加标准的回收率为97．6-102．4％。     

石墨炉原子吸收法测定工业废水中铜

由于工业废水中铜含量较高，在正常测试条件下不能直接用石墨炉原子吸收法进行测定．但可以通过改变特征波长、灯电流、时间等条件，达到直接测定工业废水中铜的目的，同时减少了样品稀释引入的误差和空白。     

石墨炉原子吸收法测定鱼肉中的铅

结合微波消解石墨炉原子吸收法测定鱼肉中的铅，快速、高效，结果令人满意。     

石墨炉原子吸收法快速测定水中铝

选择抗坏血酸为基体改进剂，以石墨炉原子吸收法测定水中铝。方法快速、简便，灵敏度可达Z3pg／0．044A,检出限为0．004mg/L,加标回收率为96％～110％。     

石墨炉原子吸收法测定湘江水的镉

以石墨炉原子吸收法测定了湘江水中的镉,方法的相对标准偏差为1.1%,加标回收率为98.46%~101.02%,检出限为6.09ug/l,有较好的精密度与准确度。样品测试简便、快捷,由分析结果可知,湘江水中的镉未超出国家地表水Ⅲ类水质标准。     

水中氰化物的间接石墨炉原子吸收法测定

文章利用氰化物能与铜离子生成络合物,再用正丁醇将络合物萃入有机相,用石墨炉原子吸收法测定络合物中铜的含量,间接求得氰的含量。该法检出限为0 .0 5 μg/ L,样品加标准的回收率为97.6%～1 0 2 .4%。     

空间7R冗余度机器人关节运动重复性问题的研究

本文针对７Ｒ冗余机器人关节运动的重复性问题进行了研究。首先,提出一种基于伪逆控制的重置初值法;然后,利用一个空间７Ｒ机器人进行了仿真分析。     

Statistical analysis of repeatability in laser percussion drilling

This study investigates the effect of six parameters in the repeatability of drilled holes in laser percussion drilling process by means of statistical techniques. Peak power, pulse width, pulse frequency, number of pulses, gas pressure and focal plane position were considered as independent process parameters. Experiments were designed with the aim of reducing the number of required experiments. The response surface method was used to develop the models for required responses. The significant factors in the process were selected based on the analysis of the variance (ANOVA). The experiments were conducted in mild steel sheet with a thickness of 2 mm. Each experiment was repeated 35 times in order to investigate the repeatability of the process. The equivalent entrance diameter, percentage of standard deviation of entrance diameter (%STD Eq Dia), circularity (ratio of minimum to maximum Feret’s diameter) and its standard deviation (STD circularity) were selected as process characteristics. The %STD Eq Dia and STD circularity, respectively, show the repeatability of equivalent diameter and circularity in the process. The results show that the process of drilling smaller hole diameters is more repeatable than drilling larger holes. Pulse width, gas pressure, focal plane position, peak power and number of pulses, respectively, have significant effect on the repeatability of hole diameter and circularity. Pulse frequency has no significant effect on the repeatability of the process.     

直接固体进样-石墨炉原子吸收法测定茶叶中铅含量

采用直接固体进样-石墨炉原子吸收光谱法测定茶叶中铅含量,无需繁琐的样品消解过程,称样量小,方法简便,准确度较高,可实现铅的快速分析。本方法中铅的检出限为0.021ng,相对标准偏差为7.72%。     

血液中铅镉分析方法的研究

在人体中,铅和镉都属于有害元素。随着工业的发展,铅、镉的世界排量及排入环境汇总的量逐年增加,排入环境中的铅和镉通过空气、水、食物、烟草、饮料等途径进入人体,对人体健康构成潜在危害。本文利用石墨炉原子吸收光谱法,采用直接稀释方式处理血液,并用中国疾病预防控制中心的标准样品进行对比。结果表明,利用血液铅镉分析仪作为分析仪器,直接测定血液中铅、镉含量,结果可靠。     

重复性与再现性对控制图的影响分析

测量系统的波动是测量值变异的一个重要来源,它对于过程控制和控制图的灵敏性都会造成影响。基于测量系统的重复性和再现性分析,讨论测量系统能力大小对X控制图灵敏性的影响。结果表明,符合能力评价指标要求的测量系统对控制图灵敏性的影响不是很明显,否则影响较大,并通过一个例子验证此结果。     

食品中铅的快速检测方法研究

本文建立直接固体进样-石墨炉原子吸收光谱法检测食品中铅的快速方法,采用铅标准溶液绘制标准曲线,0.1%Pd(NO_3)_2溶液作基体改进剂,优化石墨炉升温程序。方法的定量检出限为0.050ng,在奶粉、饼干基质的添加水平为0.5ng、1.0ng、2.0ng,回收率为95%～104%(n=6)。采用本方法对食品中铅进行测定,结果与微波消解石墨炉原子吸收法(AAS)和电感耦合等离子体质谱法(ICP-MS)的测定结果基本一致。固体样品直接测定,能避免样品消解过程中带来的污染,节约分析时间和成本。     

可溶滤膜富集-石墨炉原子吸收法测定钯

本文提出一种基于将钯(Ⅱ)与1-亚硝基-2-萘酚-3,6-二磺酸钠形成阴离子螯合物,再与十四烷基苄基胺阳离子表面活性剂缔合,此离子缔合物放收集在o.3μm硝酸纤维素膜上,用小体积的浓硫酸溶解滤膜和缔合物后于石墨炉原子吸收法测定ng/L级钯的新方法。在2.0~108ng钯/5mL范围内线性良好,富集倍数超过40倍,在10倍预富集时,检测限为12ng/L,常见离子不干扰,用于富集和测定来源不同的河水和海水中钯(Ⅱ),加标回收率90.6%~100.4%。     

An investigation of accuracy,repeatability and reproducibility of laser micromachining systems

Component technologies of laser micro machining systems are key factors affecting their overall performance. The effects of these technologies on accuracy, repeatability and reproducibility (ARR) in different implementations of such systems have to be investigated to quantify their contributions to the overall processing uncertainty, especially those with the highest impact on beam delivery sub-systems. The aim of this research was to evaluate the capabilities of state-of-the-art machining platforms that were specially designed and implemented for laser micro structuring and texturing. An empirical comparative study was conducted to quantify the effects of key component technologies on ARR of four state-of-the-art systems. In particular, the capabilities of the optical and mechanical axes were investigated when they were utilised separately or in combination for precision laser machining. Conclusions are made about the positional accuracy of the mechanical and optical axes and the importance of their proper calibration on the systems’ overall performance is discussed. It is shown that the laser machining platforms can achieve repeatability and reproducibility better than 2 μm and 6 μm, respectively.     

直接固体进样-石墨炉原子吸收法测定土壤中铅含量

本研究采用直接固体进样技术测定土壤中重金属铅含量。通过灰化温度的优化选择,避免待测元素的损失。同时采用添加基体改进剂技术,避免土壤中复杂基体的影响。本方法中铅的检出限为0.018ng。通过重复性试验和加标回收试验,验证方法的可靠性,RSD在7.3%~11.4%之间,回收率在89.8%~102.2%之间。和湿法分析方法比较,该法不需对样品进行化学前处理,实现土壤样品中铅的快速分析。     

聚胺酯泡塑富集-石墨炉原子吸收法测定痕量钯的研究

在强酸性条件下 ,利用聚氨脂泡沫塑料对样品中钯 (II)离子的选择性吸附作用 ,对钯离子进行富集 ,泡塑经HNO3、HClO4 等消解处理 ,然后加入基体改进剂Ni(NO3) 2 ,经石墨炉原子吸收法 (GFAAS)测定其中金属钯元素的含量。实验结果显示 ,金属元素钯在 0～ 72ng/mL范围内线性关系良好 ,线性方程为A =0 0 1115 +0 0 0 6 6 5×C(ng/mL) ,相关性系数r=0 9984 3,检出限为 0 4 887ng/mL。标准矿样加标回收率为 10 7%左右 ,尘土样品加标回收率为 98 1%～ 10 2 1% ,结果令人满意