精密度

We applied spectrophotometric method to detect the total content of barbaloin in the hydrolysis of aloe vera gels. Relative standard deviation was 2.39%and recovery 90.1%.

本文用分光光度法测定水解后的市售某芦荟胶囊中芦荟甙的总含量，并进行了回收率和精密度试验，结果较为满意。

The method is easy, fast and precise and can fit for determining barrenwort in the health food .

该法简便、快速、定量准确、精密度好，适合于保健食品中淫羊藿苷的测定。

Mg/ml, the average recovery 101.6%, and the RSD lower than 10%. Conclusion:The method is easy, fast and precise and can fit for determining barrenwort in the health food .

该法简便、快速、定量准确、精密度好，适合于保健食品中淫羊藿苷的测定。

ENR concentration of 50% ENR inhibited (I50) in PBS was 16.26ng/ml, I50 of ciprofloxacin, ofloxacin, gentamicin, benzylpenicillin potassium and sulfadiazine were all over 3000ng/ml, cross-reaction between those five antimicrobial agents and ENR were all below 0.54%, that is to say, the antisera had no cross-reactivity with other fluoroquinolones and antibiotics.

以上结果说明该方法特异性好，选择性高，灵敏度、精密度和准确度均基本符合残留检测要求。4。

Results The main biochemic al items such as pH,osmole,electrode slope and linear scope between our develope d internal standard A and the primary internal standard A in NOVA 16 analyzer re agent pack were in good accordance.

结果：自配内标准A液与原装内标准A液的主要理化指标：pH 、渗透压、电极斜率、线性范围均一致，自配内标准A液的精密度与原装内标准A液所测结果之间的相关性(r＝0.950～1.000)及自配A液的批内(P＞0.05)、批间(P＞0 。05)稳定性较好，长期使用对电极无损害。

Guangdong college of pharmacy,guangzhou,guangdong 510006,china;henan university of traditional chinese medicine,zhengzhou,henan 450008,chinaabstract:objective to establish a method for the determination of the content of total alkaloid in nao mai tong recipe.methods acid dye colorimetry was used in the determination with bromocresol green buffer solution as the color developing agent with absorbance was determined at the detection wavelength of 417 nm.results the calibration curve of the absorbance was linear with the concentration of ligustrazine in the range of 0.031～0.153 mg/ml(r=0.9998).the average recovery of ligustrazine was 100.95％,rsd=1.75%.

作者单位：广东药学院中药化学与分析教研室，广东广州 510006；河南中医学院，河南郑州 450008 目的建立脑脉通有效部位中总生物碱的含量测定方法。方法采用酸性染料比色法，以溴甲酚绿缓冲液作为生物碱的显色剂，测定样品溶液在417 nm波长处的吸收度。结果对照品川芎嗪质量浓度在0.031～0.153 mg/ml的范围内与吸光度呈良好的线性关系，r=0.9998。平均回收率为100.95％，rsd为1.75％。精密度和稳定性良好。

This method is simple, precie, accurate, and it can be used for determination of Capparis spinosa L.

所建方法简便快捷、精密度高、准确性好，可用于维药刺山柑种子中挥发油的测定。

Experimental results showed that the relative average error of the proposed method, the hydrazine hydrate gravimetry and the ammonium chloroplatinate gravimetry is -0.14%~+0.13%,-0.21%~+0.21% and -0.13%~+0.14%, respectively, and the relative standard deviation of three methods is 0.05%~0.08%, 0.11%~0.14% and 0.08%~0.09%, respectively, for Pt content from 37% to 65%. Therefore, the accuracy and precision of the proposed method are almost the same with hydrazine hydrate gravimetry, and are a little better than ammonium chloroplatinate gravimetry. But it is rapid, economic, secure, easy to operate and environmental friendly.

结果表明：测定37%~65%的Pt含量，本法、氯铂酸氨重量法、水合肼还原重量法的相对平均误差分别为-0.14%~+0.13%、-0.21%~+0.21%、-0.13%~+0.14%，相对标准偏差分别为0.05%~0.08%、0.11%~0.14%、0.08%~0.09%，故本法的准确度和精密度与水合肼还原重量法的基本一致，较氯铂酸氨重量法的略好；但本法消解快速、节能、安全，操作简便，对环境污染程度小，适宜推广运用。

In the experiment, the Cichorium glandulosum Boiss et Huet powder was digested with HNO3 by microwave digestion before determination.The eightmet alelements, potassium, nickel, calcium, magnesium, iron, manganese, copper and zinc, in Cichorium glandulosum Boiss et Huet were determined by FAAS.

试验采用HNO3 作为消解液，利用微波消解的方法处理样品，原子吸收分光光度法测定维吾尔药材菊苣根中钾、镍、钙、镁、铁、锰、铜和锌八种微量、常量元素的含量，精密度和回收率较好，回收率控制在92.25%～110.5%之间，相对标准偏差RSD曑3.88%。

ConclusionThis method is simple, stable and reproducible.It can be used to identify and effectively control quality of Poria cocos herbs.

结论该方法简便，稳定，精密度高，重复性好，可用于茯苓饮片的鉴别，能够有效控制饮片质量。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。