精密度

To control the slope of standard curve in spectrophotometry by using the two kinds of graphics of Youden,we can directly find out the quality of the data,accuracy and precision of the measuring point.

应用尤登双样图对分光光度法进行标准曲线斜率的控制，能简单直观地了解数据质量，看出测点的准确度和精密度，可用同心圆确定测点所代表的标准曲线的斜率是否可接受

K + can be quantitatively precipitated with sodium tetraphenylboron in HAC\|NaAC buffer solution (pH5~6) and the amount of excess Na\|TPB can be determined by oscillographic titration with a standard solution of tetraethylammonium chlorid monohydrat.

报道了用示波滴定法测定黄原酸钾含量，在 p H5～ 6的 HAc- Na Ac缓冲底液中，加入四苯硼钠沉淀 K+，过量的 Na- TPB用氯化四乙基铵标准溶液滴定，滴至 Na- TPB示波图切口消失为终点，终点直观敏锐，方法快速简便，准确度、精密度均高。

Accuracy for the centring measurement can be attained only with the precision centring holder.

自定心固定器得根据测量功能的改变而转换，定心测量指定的准确度只能通过精密度定心固定器来获得。

The watermelon sample was extracted with ultrasound,protein was precipitated with potassium ferrocyanide and zinc acetate,and the pigment was decolored with activated carbon,nitrate would produce yellow compound with phenonldisulponic acid on condition of base.

在超声器中提取西瓜样品，用亚铁氢化钾和乙酸锌沉淀蛋白，活性碳脱色素，酚二磺酸碱性条件下和硝酸盐生成黄色化合物，样品的硝酸盐检测结果有较好的准确度和精密度，能满足样品分析需要。

BQJ-34 was cultured on the biotin fermentation media for 48 hour ,a 10ml fluid medium was boiled for an hour and was centrifuged (10,000r/min , 30 min), the supernatant is filleted with the 0.22μm filters and the biotin content of filter liquid is detected by RP-HPLC based on the biological samples regression analysis, recovery, accuracy testing.

利用生物素培养基对菌株BQJ-34进行振荡培养，取48h的细菌培养液10ml置100℃条件下水浴1 h，随后在超速离心机上以10 000 r/min，30 min离心，取上清液用0.22μm滤膜过滤，用高效液相检测滤液中的生物素含量，并通过对生物素样品的回归分析和回收率、精密度试验，最终确定利用反相高效液相色谱法可用于培养液中生物素测定，其最佳检测条件是：用安捷伦Zorbax SB-C18(4.6~※250cm，5μm)色谱柱，以K_2HPO_4(0.04mol，pH2.5)和CH_3CN(二者体积比为91.5：8.5)为流动相，紫外检测波长为215nm。

In this paper,the Graphite Furnace Atomic Absorption Spectrometry was applied to the determination of molybdenum in lixiviated solution discharged from plants of producing Fe and Mo.

用石墨炉原子吸收光谱法测定钼铁厂固体废物浸出液中的钼，当选择合适实验条件的情况下，钼的测定灵敏度较高，校准曲线的相关系数大于0.999，精密度较好，方法的检出下限为0.6μg/L，定量测定范围2.4～60μg/L，测定结果令人满意

The drift tube temperature was 45 ℃, ELSD was used as the detector with pressure of nebulizing gas of 368 Pa.

结果 异帕米星在0.1~0.8 mg/mL的范围内呈较好的线性关系(r=0.9995)，平均回收率101.0%，RSD=0.32%；系统精密度RSD=0.34%。

ML.min-1. The drift tube temperature was 45 ℃, ELSD was used as the detector with pressure of nebulizing gas of 368 Pa.

结果 异帕米星在0.1~0.8 mg/mL的范围内呈较好的线性关系(r=0.9995)，平均回收率101.0%，RSD=0.32%；系统精密度RSD=0.34%。

The average recoveries of 5 elements were between 91% and 112% while the precisions were less than 2%.

结果：5种重金属元素的回收率在91%～112%，精密度＜2%。

Limit of detection for the method was 0.036μg/mL. The recoveries were 96%~102%.

该方法的最小检出限为0.036μg/mL，回收率为96%~102%，精密度＜1.5%。

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。