基于原子荧光色谱法的食品重金属检测新技术

食品中重金属超标将会严重危害人体健康,传统方法对食品重金属检测采用自激荧光法,随着食品中重金属活泼性的降低,检测性能不好。提出一种基于原子荧光色谱法的食品重金属检测新技术。分析了重金属原子荧光色谱吸收与荧光光谱吸收原理,采用磷酸二酯菌进行食品重金属的发光度抑制,采用HAu Cl4进行红外光谱接收,采用实验分析方法进行食品重金属检测,通过原子荧光色谱法,得出蓝光波段下Cu2+,Fe3+,Zn2+,Pb2+发黄色荧光,有效实现了重金属检测,准确性能较好。     

农产品中展青霉素检测的研究进展

介绍了液相色谱法与免疫学检测方法检测农产品中展青霉素的应用情况,并展望了未来的发展前景.     

工业气相色谱仪简介及案例分析

介绍了色谱仪的原理、色谱法工作原理,分析了各级色谱柱的功能和柱阀切换时间。结合贵溪冶炼厂使用工业气相色谱仪过程中出现的FID检测器的火焰会熄灭、分析谱图上出现鬼峰等两个具体案例,提出了故障分析及相应的维修对策。     

室内空气中TVOC浓度检测准确性影响因素的探讨

针对<民用建筑工程室内环境污染控制规范>GB50325-2001(2006版)使用中存在的一些问题,从采样过程和热解析过程,对热解析气相色谱法检测室内空气中TVOC浓度的影响因素进行分析,并对有关问题进行了探讨.     

气相色谱法热值仪在韶钢的应用

介绍了气相色谱法热值仪系统的构成和工作流程,阐述了其测量原理,重点分析了气相色谱法热值仪在高炉煤气热值分析中的应用及其在生产中出现的问题,并提出了解决的方法。     

微波激发氧弹燃烧-离子色谱法检测煤炭中氟和氯

采用微波消解系统配置氧弹,建立了微波激发氧弹燃烧处理煤炭样品,离子色谱法检测氟、氯的方法。前处理采用30min氧弹回流时间、50mmol/L碳酸铵吸收液,添加15%的石英砂可极大地提高氟的回收率,同时又不影响氯的吸收;离子色谱法检测时采用碳酸钠和碳酸氢钠混合淋洗液,流速为1.00mL/min。实验方法用以检测煤炭中氟和氯的检出限分别为0.010mg/L和0.011mg/L。氟、氯质量浓度在0.05~50mg/L范围内与峰面积线性相关,校准曲线的相关系数均大于0.999。对煤炭标样及实际样品进行分析,煤炭标样的测定值与认定值一致,结果的相对标准偏差(RSD)小于5%;实际样品的结果也满足相关标准的要求。     

离子色谱法测定防锈油中氯离子

建立了离子色谱法检测防锈油中氯离子的测定方法。在碱性介质中,Cl-与Na+生成热稳定性较好的盐,在550℃将样品灰化60 min,除去有机物组分,以消除其对色谱柱的污染和对测定的影响。用热水提取灰分中氯离子,过滤后用离子色谱法进行分析。对样品处理及灰化条件进行探讨并对色谱条件进行优化,在最佳实验条件下,氯离子的检出限为1.12μg/L,加标平均回收率在90%~106%之间,相对标准偏差优于8.6%(n=11)。防锈油中各组分对测定无干扰,用于实际样品测定结果满足分析要求。     

RP-HPLC法测定辅酶Q10含量及其透光率的日变化分析

[目的]建立高效液相色谱法测定辅酶Q10的含量.[方法]采用反相高效液相色谱法(RP-HPLC)洲定辅酶Q10的含量,并采用紫外分光光度计法对其透光率的日变化进行了分析.[结果]辅酶Q10在RP-HPLC操作条件下分离度良好.在40～300 μg/ml范围内与峰面积线性关系良好(r=0.999 9);最低检测限为0.4 ng;平均回收率为97.44%(n=3).RP-HPLC方法的系统适应性良好,回收率和精密度均满足分析要求.[结论]该方法简便、准确、重现性好,可用于辅酶Q10的质量控制,但应注意避光操作.     

离子色谱法对纯水中痕量阴离子测定的研究

就离子色谱法应用于纯水中痕量无机阴离子的检测进行了试验研究。该方法可同时对 μg/L级F- 、Cl- 、NO3- 、SO42 - 进行快速、准确的检测 ,干扰少 ,操作简单 ,且试验无毒性 ,不会带来二次污染。回收率达到 85%～ 1 1 2 % ,灵敏度达到 0 0 0 2 μg/mL ,相对标准偏差为4 2 2 % ,该方法在宝钢纯水领域的痕量分析中得到广泛的应用     

大口径毛细管柱气相色谱法在精萘分析中的应用

采用大口径毛细管柱气相色谱法分析精萘，可以克服小口径柱进样要求严格的缺点，准确度和精密度高。介绍了用大口径毛细管柱气相色谱法分析精萘的操作条件及有关事宜。     

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。     

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.     

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。     

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)     

Comparison of rates of infection of two methods of emergency ventricular drainage

The rates of infection of two methods of external ventricular drainage in use at Atkinson Morley's Hospital--namely, (a) percutaneous drainage with Rickham reservoirs and (b) tunnelled ventriculostomies--were compared in this retrospective review. Percutaneous drainage of CSF with Rickham reservoirs was associated with a 27% rate of infection as identified by positive microbiological cultures; tunnelled ventriculostomy catheters had a 10% infection rate. The difference in the infection rate between the two methods was statistically significant (P < 0.015). Other variables examined, including the age and sex of the patients and the reasons for ventricular drainage, were not associated with an increased rate of infection. Most infections from either method were caused by a coagulase negative staphylococcus. The average duration of ventricular drainage before identification of positive cultures was 5.7 days for Rickham reservoirs and 6.0 days for ventriculostomies.     

浅析《野草》的版画特征

鲁迅先生一生热爱美术作品,对版画中木刻兴趣尤甚.<野草>作为其"写心之作",亦呈现出一些与木刻版画一致的审美特征:一是具有木刻版画的色彩特征,多对比、多冷色,有阴郁的美感;二是具有木刻版画的力度特征,环境描写、人物刻画处处刀锋毕现,遒劲有力,有一种"力之美".     

四辊破碎机车刀架的改造

针对四辊破碎机车刀架车削中存在的几个问题,详细介绍了电动车刀架的结构和工作原理,建立主要设计参数的数学表达式,并进行适当的分析。改造后,这种电动车刀架运行平稳、可靠、方便、省力,取得了预期的效果。     

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.