电感耦合等离子体原子发射光谱法测定锰铁合金中铬硅磷

探讨了电感耦合等离子体原子发射光谱法(ICP-AES)测定锰铁合金中铬、硅、磷的分析条件。试样经过氧化钠熔融分解,盐酸酸化,采用ICP-AES于同一试液中联合测定铬、硅、磷。铁、锰的背景干扰采用背景校正扣除;样品溶液中加入内标元素锶,有效克服了仪器波动产生的影响。确定了仪器的最佳分析条件,选择铬、硅、磷的内标谱线分别为346.446,215.284,177.839nm,分析谱线分别为267.716,212.412,178.287nm。该法已用于锰铁合金中铬、硅、磷的测定,测定结果与化学法相符,相对标准偏差     

电感耦合等离子体原子发射光谱法同时测定废水中锌、铬、铅、镉、铜和砷

应用电感耦合等离子体原子发射光谱法(ICP-AES)同时测定废水中的Zn,Cr,Pb,Cd,Cu和As 6种元素。对波长、入射功率、雾化压力、提升量等分析条件进行优化。样品中的干扰因子通过谱线的背景校正方法予以消除。测定各元素的线性关系良好,相关系数均在0.999 4以上,各元素的检出限在0.000 7~0.008 5μg/mL之间,样品分析结果的相对标准偏差均小于5.46%,加标回收率在94.0%~105.0%。     

ICP-AES法同时测定钛合金中八种元素的研究

研究了应用ICP-AES法同时测定钛合金中的铝、钼、铁、硅、铬、钒、锡争锆等八种元素。主要研究了多元素同时测定时分析谱线的选定及对干扰元素进行分析，通过对分析条件的选择，最大限度地避开了干扰元素对测定的影响；同时进行了酸度试验、回收率试验、精密度试验。试验结果表明：方法快速、准确，测定各元素含量范围为0．01％-9．0％，已应用于产品的检验。     

偏硼酸锂熔融-电感耦合等离子体发射光谱法测定铝土矿石中多种元素

建立了电感耦合等离子体发射光谱法同时测定铝土矿石中二氧化硅、三氧化二铝、三氧化二铁、氧化钙、氧化镁、氧化钾、氧化钠、二氧化钛、五氧化二磷9种元素含量的分析方法。采用偏硼酸锂熔融样品,通过试验确定了各元素的分析谱线,对试液的酸度进行了探讨。9种元素的检出限为0.037μg/ml～0.705μg/ml,加标回收率为97.59%～101.49%,测定结果的相对标准偏差0.83%～3.20%(n=6).该方法灵敏度高,适用于铝土矿石多种元素的同时测定。     

电感耦合等离子体原子发射光谱法测定锆及锆合金中钛

探讨了电感耦合等离子体原子发射光谱法(ICP-AES)测定锆及锆合金中钛的条件并建立了测定方法。采用盐酸、氢氟酸和硝酸溶解试样, 选择波长339.4 nm(样品不含铌时)和338.3 nm(样品含铌时)的谱线作为钛分析线, 在选定的仪器工作条件下对试液中钛进行测定。锡、铁、铬、镍对钛的测定无影响, 基体元素锆和合金元素铌对钛测定的影响可以分别采用基体匹配和选择不同波长谱线作为钛分析线的方法克服。在选定的仪器工作条件下, 对锆及锆合金试样中钛含量进行多次测定, 结果与分光光度法(GB/T13747.1992)、直流电弧原子发射光谱法的测定结果基本一致, 相对标准偏差(n=9)均小于15%。方法的精密度和准确度均满足科研生产的检测要求。     

电感耦合等离子体原子发射光谱法测定偏钒酸钾中钾

试样经盐酸和硝酸消解后用水稀释和定容,以电感耦合等离子体原子发射光谱法(ICP-AES)测定试液中钾含量。通过控制取样量和定容体积,有效将钾元素检测信号的强度值调控到适宜水平,确保方法具有良好的动态线性范围。考察了基体效应、光谱干扰以及背景影响等因素,通过采取优选雾化器压力、等离子体激发功率、观测高度等仪器工作参数以及元素分析谱线、背景校正位置等措施,并结合基体匹配和同步背景校正方式,消除了碱金属离子、高钒基体、氩气分子谱带等对试液雾化传输、ICP平衡与激发、背景噪音和元素测定等影响因素。结果表明:钾的质量分数在40%以下校准曲线呈良好线性关系,相关系数为0.999 3。对本法的精密度和回收率进行试验,得到RSD小于1.0%,平均回收率为103%。方法用于实际样品中钾测定,测定结果与四苯硼酸钾重量法的测定结果相一致。     

微波消解-电感耦合等离子体原子发射光谱法测定锌精矿中有害金属元素

采用微波消解-电感耦合等离子体原子发射光谱法测定锌精矿中铅、铬、镉、砷、铜、钴、锑、锡和锰等有害金属元素。对微波消解条件、称样量、测定介质进行了研究,选择了各元素的分析谱线,对基体及共存元素间干扰进行了详细讨论。在仪器最佳工作条件下,测定各元素的检出限为0.0004～0.018mg/L,相对标准偏差(n=11)为0.41%～5.43%。该方法用于标准物质的测定,结果与认定值吻合较好。     

电感耦合等离子体原子发射光谱法测定铝铁合金中硅磷锰钛

考察了用电感耦合等离子体原子发射光谱法(ICP-AES)测定铝铁合金中硅、磷、锰和钛的分析条件并建立了测定方法。铝铁合金试样经盐酸、硝酸和氢氟酸分解,在射频功率为1 150 W、雾化压力为0.22 MPa、辅助气流量为0.5 L/min、蠕动泵泵速为50 r/min、长波曝光时间为5 s、短波曝光时间为15 s的条件下,使用耐氢氟酸的雾化器和矩管,以ICP-AES测定了试液中硅磷锰钛。通过选择灵敏度适宜和没有干扰的谱线作为被测元素的分析线消除了谱线的重叠干扰,铁铝产生的背景干扰采用背景校正方法扣除。本法已用于铝铁合金样品中硅、磷、锰和钛的测定,其测定值与湿法的测定值相符,测定结果的相对标准偏差≤3.0%。     

ICP-AES法测定不锈钢中多种元素

用ICP AES法同时测定了不锈钢中的铬、镍、钛、硅、锰、磷、铜、钼 ,替代了以化学法分别单独测定上述各元素。通过对ICP控制条件的选择 ,确定了各元素的测定谱线 ,进行了共存元素干扰试验 ,采用干扰系数法校正基体干扰和待测元素间的干扰 ,以 10 %混合酸作为低标 ,以同牌号标准样品作为高标 ,对上述元素进行了准确度及精密度试验 ,并与化学方法 ,原子吸收光谱法进行了对照。方法简便、快速 ,结果令人满意。     

火花放电发射光谱法同时测定铍青铜中多种元素

为了满足铍青铜化学成分快速测定需求,开发了利用火花放电发射光谱法直接测定铍青铜中Be、Co、Pb、Fe、Al、Ni、Si 7种元素的方法。用120目(124μm)刚玉砂纸打磨样品表面,优化光源激发条件为:冲洗时间10s;预燃时间15s;积分时间10s;频率500Hz;预燃能量0.5;积分能量0.09;氩气流量9L/min;以Cu 296.1nm谱线作为参比线,优选各元素的线性和精密度均较好的谱线作为该元素的分析谱线。利用购买的标样与电感耦合等离子体原子发射光谱法(ICP-AES)和原子吸收光谱法(AAS)共同定值的内控样一起绘制校准曲线,各元素校准曲线线性相关系数R~2均在0.995以上。对样品进行精密度试验考察,各元素测定结果的相对标准偏差(RSD,n=11)在0.39%~1.5%之间。对铍青铜未知样品进行正确度考察,测定值与湿法结果一致。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.