浓度测定

PAHs ratios are used to identify the source of PAHs, the result showed that the major source of 16 PAHs in Urumqi Xinshi district was coal-bustion and vehicle discharges . Mercury in TSP samples were digested by aqua regia and analyzed by AFS analyzer .The results showed that : the concentration of mercury was 0.869-1.91 ng m-3.Compared with other cities in the rest of the world , the concentration of mercury was very high. The concentration of mercury in heating season was lower than that in no-heating season.

对大气颗粒物样品中的汞，采用王水于特弗龙消解罐中加热消解的方法进行处理，稀酸定容后采用原子荧光光谱法对样品中的汞进行测定，测定结果为。869-1.91 ng m-3，与国外城市相比较高；实验测得非采暖期乌鲁木齐大气颗粒物汞浓度的均值高于采暖期颗粒物中的汞浓度，其原因可能是由于随着非采暖期温的升高，长期积累在土壤、水体环境中的汞向大气中释放，附着在颗粒物上，过了燃煤的影响。

The concentration distribution of pulverized coal in blowpipe of blast furnace was measured in an isothermal two-phase model by means of a computer measuring system based on infrared transmission.

利用开发的红外透射法粉体浓度计算机测定系统，在高炉氧煤喷吹气-固两相流动模拟装置上测定了氧煤枪的煤粉浓度场。

breast cancer cell line MCF-7 were marked killed by trametes robiniphila murr in certain concentration. The IC50 of trametes robiniphila murr in three days to MCF-7 was about 0.05mg/ml. Its cell toxin were increased while the touched time was delayed or the concentration was advanced. Trametes robiniphila murr also can advance cell toxin of adriamycin and reverse resistance of MCF-7/Adr.

用MTT 法测定不同浓度的槐耳浸膏作用不同时间下对乳腺癌细胞系MCF-7 的杀伤作用，同时测定应用槐耳浸膏时对阿霉素的增敏作用和耐药逆转作用；结论：金克在一定范围内对乳腺癌细胞系具有明显的杀伤作用，其作用3 天时，IC50 在0.05mg/ml 左右，随着药物浓度升高和作用时间的延长其杀伤作用相应的增强，对阿霉素化疗具有增敏作用和逆转耐药作用。

In this study, sulfate radical concentration from 4 drip water points (PL1, PL2, SH, JG) in the Shihua cave have been monitored for three years, and those from the drip water point was monitored for two years. Drip discharges show three types of response to surface precipitation variations: rapid response, response with associated time-lag and stable. The results show that:(1) SO(superscript 2- subscript 4) concentration in rapid response drip water increases sharply during rain period and has a exponential relationship with drip rate;(2) in the drip water of lag response, SO(superscript 2- subscript 4) concentration has no significant incrcase during rainfall, but they show a increasing trend during a long-term monitoring;(3) SO(superscript 2- subscript 4) concentration at the stable drip site is low and has no obvious change during wet weason.

本文通过对石花洞洞穴4个滴水点（JG， SH， PL1和PL2）硫酸根浓度近3个水文年的分析测定，结果表明：响应降雨快的滴水点滴水SO(上标 2-下标 4)浓度升高幅度最明显，且滴水SO(上标 2-下标 4)浓度与滴率成指数关系；滞后响应降雨的观测点滴水SO(上标 2-下标 4)浓度雨季升高幅度不明显，但在长期观测期间有明显增加的趋势；对降雨没有响应的滴水点，其SO(上标 2-下标 4)浓度低且雨季没有明显变化。

The optimal determining conditions were obtained: adding quantity of a monolayer medium 15ml, the suspension concentration of Micrococcus luteus 109 cfu/ml, the adding quantity of Oxford Plate 100μl, agar concentration 1%, the concentration of Na2HPO4 1％, and the pH of the medium adjusted to 7.0. The medium was optimized by single factor and the orthogonal experiments on the basis of the centrifugate of distiller's grains. The optimal composition was obtained as follows: sucrose 0.6, peptone 0.1, yeast extract 0.2, K2HPO4?

以管碟法为基础，对影响Nisin效价测定的各种主要因素进行了分析，并得出了Nisin效价测定的最佳条件：采用单层培养基（每个平板加量为15ml），检测培养基中Na2HPO4·12H2O浓度改为1％，菌悬液浓度109cfu/ml，不加吐温20，琼脂浓度1％，培养基pH7.0，牛津杯加液量100μl ，30℃培养24小时。

A modified analysis method based on the determination of ozone—indigo disulphonate spectrophotometer(GB/T 15437-1995) in gas phase has been developed to detect the concentration of ozone in liquid phase. An analytical condition of λmax=612～615 nm,ε=20 000 L/, pH 2 is obtained by the titration of indigo disulphonate. Compared with potassium iodide method,it shows a higher precision and accuracy,CV＜3.0%. The results also prove that blank experiment will bring about 5.0%systematic error.

在气相臭氧浓度的靛蓝二磺酸钠分光光度法(GB/T15437-1995)基础上提出了液相臭氧浓度的测定方法，采用靛蓝二磺酸钠标准曲线法代替采用易分解的臭氧标准曲线法，得出测定条件λmax=612～615 nm、ε=20 000 L/、pH为2，通过碘量法比较实验，说明新的测定方法具有较高的精度和准确度，相对标准偏差小于3.0%；比较结果表明忽略空白实验将引入5.0%的系统误差。

Chinensis and Kuruma prawn M. japonicus increased at 12 and 48 hours post-inoculum, but decreased sharply after 36 and 72 hours post-inoculum respectively. LPS inducible NOS activity also decreased significantly with the time elapsed in WSSV infected shrimps. Results of WSSV detection with the Dig-DNA Probe dot blot hybridization test showed that WSSV of the two penaeid species couldn't be detected until iNOS started decreasing.

在此基础上，我们建立了对虾血细胞中诱导型一氧化氮合成酶的鉴定方法—硝基四氮唑蓝还原法和血细胞形态法以及酶活力的测定方法—L-瓜氨酸分析法和亚硝酸盐分析法并优化了鉴定和测量条件，结果显示：对虾血细胞在4℃下与L-精氨酸和LPS孵育8h以及当L-精氨酸浓度为2.5mmol l〓LPS浓度为100μg ml〓，Ca〓浓度为2.5mmol l〓时，iNOS活力的测定结果最佳。

From the experiment discovered for the first time the dimethyl ether may substitute CO to take the chain-carrying agent of the peroxy free radical chemistry amplifier system, and optimized the CH_3OCH_3-NO-HO_2 chemistry amplifying system determination condition, the CH_3OCH_3 best density is 1.876 ppmv, the NO best density is 1.3ppmv, and obtained this method chain length CL=124, 5 parallel determinations densities of HO_2 are the 44.0pptv, the relatively standard deviation is smaller than 4%; Although chemistry box model computed result indicated the dimethyl ether, the ethene, the propene and the ethanol all can take the chain-carrying agent of the peroxy free radical chemistry amplifier system, and their simulation chain length all grows up compared to the CO-NO-HO_2 chemistry amplifying systems, but experiments proved the ethene, the propene and the ethanol have not suit the chain-carrying agents.

首次从实验上发现二甲醚可以替代CO作为过氧自由基化学放大系统的链传递试剂，并优化了CH_3OCH_3-NO-HO_2化学放大系统的测定条件，CH_3OCH_3的最佳浓度是1876ppmv，NO的最佳浓度为1.3ppmv，并得到了这一方法的链反应长度(CL=124)，5次平行测定浓度为44.0pptv的HO_2自由基，相对标准偏差＜4％；虽然化学盒子模式计算结果表明二甲醚、乙烯、丙烯和乙醇都能作为过氧自由基化学放大系统的链传递试剂，并且它们的模拟链长都比CO-NO-HO_2化学放大体系的链长大，但是实验证明乙烯、丙烯和乙醇不适合作为过氧自由基化学放大系统的链传递试剂。

The effects of solution\'s pH value, mol ratio between phenyl aldehyde and L-Arginine, concentrations of sodium chloride, ammonia chloride andL-Lystine, initial concentration of L-Arginine on precipitation rate of a -tolylene arginine were investigated, the results indicated that phenyl aldehyde precipitation method\'s appropriate pH value was higher than 11, suitable mol ratio between phenyl aldehyde and L-Arginine was 1.25, initial concentration of L-Arginine was must higher than 15g/L, sodium chloride had little effect on precipitation rate, on the contrary, ammonia chloride and L-Lystine had great effect on it, both of them must be eliminated; At the same time, adsorption isotherm at 25 C of L-Lystine on anion exchange resin A was measured, the result showed that the maximal equilibrium adsorbance was 30mg/g, the influences of solution\'s pH value, temperature, concentration of chloride ion on adsorption of L-Lystine by anion exchange resin A were also studied, the results indicated that appropriate operational pH value was 0.5 0.2, the effect of temperature on adsorption ratio was little, process could be operated at room temperature, the concentration of chloride ion must be eliminated.

考察了溶液pH值、苯甲醛与L-精氨酸摩尔比、氯化钠与氯化铵浓度、L-赖氨酸浓度、L-精氨酸初始浓度对苯甲醛沉淀L-精氨酸的影响，结果表明，沉淀反应的适宜pH值大于11，苯甲醛与L-精氨酸的适宜摩尔比为1.25，(来源：Aa6BC论文网www.abclunwen.com)L-精氨酸适宜的初始浓度在15g/L以上，氯化钠的存在对沉淀率基本上没有影响，而氯化铵和L-赖氨酸的存在使沉淀率下降；同时测定了25℃时阴离子交换树脂A吸附L-赖氨酸的吸附等温线，表明其最大平衡吸附量为30mg/g，考察了溶液pH值、温度、氯离子浓度对阴离子交换树脂A吸附脱除L-赖氨酸的影响，结果显示从L-精氨酸和L-赖氨酸混合液中吸附分离出L-赖氨酸的适宜pH值为10.5±0.2，温度对L-赖氨酸吸附率影响不大，吸附过程可在室温下进行，氯离子的存在使L-赖氨酸的吸附率降低。

The concentration of PM10 was measured by the monitoring and meteorological experiments from February 2006 to December 2006, and the change law of PM10 concentration on daytime and every year have been got: PM10 concentration in the daytime in Nanjing reaches the supreme value in one day at 11 o'clock in the morning, but the low ebb of PM10 concentration from side to side at 16 o'clock in the afternoon; Spring and summer is to hit in one year the low-level period of PM10 concentration, but the festival PM10 concentration in autumn and winter presents higher level.

通过PM10浓度监测实验和气象监测实验，测定了2006年2月至2006年12月期间，南京城市PM10的背景浓度值，得到PM10日变化规律和年变化规律，南京白天PM10浓度在早上11时达到一天中最高值，而在下午16时左右为PM10浓度的低谷；春季和夏季是一年中PM10浓度低水平时段，而秋冬季节PM10浓度呈现较高的水平。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。