空白试验

空白试验中，经过50天的降解，土壤中DDT的残留率为79.21%；种植作物后，土壤中的大分子有机物逐渐转变为H2O、CO2及有机小分子，有效地降低了有机物的污染。

The result of the blank test has shown that the residual ratio of DDT in soil was 79.21 % after 50 days degrading , owing to the larger molecular organics being degraded into smaller molecular weight organics . Therefore , the contamination of soil has been effectively decreased .

同时由于随同试样做空白试验，消除了干扰，提高了分析精度。

In the meantime the blank test eliminates inference and improves the precision of analysis .

COD（Cr）测定中空白试验值的影响因素分析

Analysis on Influence Factors in Determination of COD_ ( cr ) Blank Value

通过稳定试验和空白试验的色度和pH值对比及色谱分析证明：微量稳定剂就能使四溴乙烷在常温下稳定两年。

Through GC analysis and the comparison of the APHA color and pH values for stability tests and blank tests , it has been proved that a little of stabilizer can keep the 1,1,2,2-tetrabromoethane steady for two years at ordinary temperature .

对HCS-140高频红外碳硫分析仪进行漂移测试、空白试验、精度测试等，并通过大量的条件实验，确定了最佳分析条件，满足了生铁分析的需要。

Through drift determination , blank determination , accuracy determination and a lot of condition experiment the optimum analysis conditions of HCS 140 high frequency infrared ray carbon sulphur analyser are determined . It can meet the requirements of analysis of pig iron .

进行样品检测和空白试验时，需使用同一个单元。

Use the same cell for sample and blank .

纳氏试剂比色法测氨氮空白试验值的探讨

Determination of Ammoniacal Nitrogen by Reagent Colorimetric Method

关于实验室内部质量控制中的空白试验值

Blank experiment value for quality control in laboratory

衡量透气性测试设备的两项指标&空白试验数据和试验结果重复性

Two Parameters for Estimating Gas Permeability Tester & " Black Test " Data and Repeatability

本文所提出的空白试验及误差分析方法，为测试微反装置的性能和判断故障提供了简捷可靠的手段。

The blank test and errors analysis suggested in this paper provide a simple and effective method to evaluate the performance of a microreactor .

方法：分别从空白试验用兔的选择，注射部位直观判断，肌肉样品采集和测试空白选择等方面，比较两国药典的差别。

Methods : Several aspects were compared , including the test rabbits selection , injection site examination , sample collection and assay blank choice .

以干周为指标，借助大量的空白试验数据，系统地研究了苹果田间试验不同的小区大小与误差变化的规律。

A systematic study was made on the variation of experimental error associated with different plot size by a large amount of uniform experiment data .

从温度控制、空白试验、操作过程和加强管理等方面，阐述了如何在煤的真相对密度的测试过程中提高测定的准确度。

This paper discussed on how to improve the accuracy of coal true relative density measurement in temperature control , blank experiment , process control and enhancing management .

试验结果表明，典型众数抽样较同时同地进行的随机抽样平均亩产量更接近空白试验所测得的每亩平均产量。

Tests showed that the average yield per mu obtained by typical mode sampling was more close to the average yield per mu actually measured in blank test than that obtained by random sampling .

结果：自体骨对照组、异体骨试验组在8周内修复骨缺损，而空白试验组仅有纤维组织，无新骨形成。

RESULTS : The bone defects were repaired within 8 weeks in the allogeneic bone trail group and autogeneic bone control group , while in the blank trail group , only fibrous tissues were found and no osteogenesis was found .

简要介绍了常见透气性测试的影响因素，并详细阐述了衡量透气性检测设备的两项主要指标&空白试验以及试验结果重复性，以及这些指标的获得与应用。

The common effect factors to the gas permeability test are introduced briefly , and expatiations on two key parameters for estimating the gas permeability tester - " Black Test " and data repeatability , as well as the gain and application of these data are described .

在刺激前用洁净空气作空白对照试验。然后在吸气早期将0.3ml刺激剂释放入右侧鼻腔，记录系统同步进行记录。

At the beginning of inspiration , 0.3 ml isoamyl acetate was delivered to the right nostril , and the potentials was recorded synchronously .

空白代谢试验结果表明：（1）试验公鸡内源磷的排泄量有较大的个体差异，最高达30.13g，最低为15.16g，变异系数最大为37.95%。

The results of control metabolism experiments were as follows : 1 . Endogenous phosphorus determined at the terminal ileum was 30.13g at most and 15.16g at least , the highest coefficient of variance was 37.95 % .

五日空白平行试验批内标准偏差及检出限计算

Calculation on Batch Standard Deviation and Detection Limit of Five Day 's Empty Parallel Test

我们进行了一个随机双盲空白对照试验，该试验分为两个阶段进行。

We conducted a double-blind , randomized , placebo-controlled trial of sildenafil in two periods .

方法：采用干酪素空白干扰试验，确定方法存在的问题。

In the study , blank interference test of casein was used to verify the ac-curacy of measuring .

用经过正交试验优化的水平配方对照空白组试验分别在常温（25℃）和低温（13℃）下进行试验，发现在低温下，芒果的失重、转黄、腐败速度明显较常温组下降。

After optimization with the level of orthogonal formulation blank control group test at room temperature ( 25 ℃) and low temperature ( 13 ℃) under test and found that at low temperatures , the weight loss of mango , yellow and corruption rate significantly decreased compared with normothermia group .

空白加标回收试验得出，PCBs的回收率为58%～125%，标准偏差为0.00173～0.00778μgL，相对标准偏差为1.58%～12.43%。

In the study , the spiking blanks experiments showed that the recoveries of the whole analysis for spiking 19 PCBs congeners ranged from 58 % to 125 % , the RSD ranged from 1.58 % to 12.43 % .

在地下水环境质量监测中对挥发酚的质量控制应采取以下措施：提纯4&氨基安替比林试剂、降低空白值的吸光度、确定检测限、空白试验的质量控制图、校准曲线的检验、考核样品的测定。

We should take following steps to control quality of volatile hydroxybenzene in ground water quality monitoring : Purify 4-AAP reagent reduce absorbency of blank value , determine detect limit , make quality control chart of blank assay , verify calibration curve and determine examining sample .