ppb

The preparation and storage of standard solutions of mercury at the ppb level

ppb级汞标准溶液的配制和保存

Investigation of storage acidity and containers of ppb level cadmium solution

ppb级镉溶液的贮存酸度和容器的研究

Preconcentration and separation for heavy metal ions at ppb levels by chemical floatation method

应用浮选分离法富集ppb级重金属离子

Studies of the determination of rare earth elements at ppb . level with ICP spectrometry

ppb级稀土元素分量等离子光谱测定的研究

Determination of Total Arsenic at ppb Levels in Petroleum by Anodic Stripping Voltammetry

阳极溶出伏安法测定石油中ppb级总砷

Automatic gas chromatographic FPD method for the determination of sulfur compounds at the ppb level in air

气相色谱火焰光度法对大气中PPB级硫化物的自动监测

The method is convenient , sensitive and reproducible with a detection limit of 5 ppb .

该方法简单，取样量少，重现性好，样品测定的检出限达5ppb。

The formation of PPB carbides is related to the amount of residual oxygen in alloy .

PPB碳化物的形成主要是和合金中残留氧量有关。

Benzene compounds of ppb level can be determined . Relative standard deviation is ≤ 3.5 % .

可对大气中10－9级苯系物进行测定，RSD≤3.5%。

Dual-wavelength spectrophotometric determination of cadmium at ppb levels with new cadion

新镉试剂双波长分光光度法测定ppb级痕量镉

DON amounts of various components were in the range of 2900 ~ 18670 ppb during milling process .

制粉过程各组分DON含量在2900～18670ppb之间。

The transcript of the PPB gene is highly conserved during evolution .

该基因在进化过程中高度保守。

The linear range is 3 orders of magnitude and the detection limits is 10 ppb .

标准曲线的线性范围达3个数量级，检测下限为10ppb，方法的平均回收率为98.7%，变异系数为2.99%。

Study on flow-injection spectrophotometric determination of ppb level silicate in boiler water and feedwater in thermal power plant

基于流动注射分析技术快速测定电厂汽水中痕量硅酸盐的研究

Experimental Conditions of Determining Cu , Pb , Cd at ppb Level by Anodic Stripping Voltammetry

阳极溶出伏安法测定ppb级Cu，pb，Cd的实验条件的选择

Several nuclei disappearance . The aflatoxin B : was found 300 ppb in feed .

饲料中黄曲霉毒素B1含量为300ppb。

The ratio of polymorphic bands ( PPB ) was 67.79 % .

扩增片段中多态性带141条，平均多态性比率（PPB）为67.79%。

The metal ions of ppb level in water samples can be measured by atomic absorption spetroscopy .

用原子吸收分光光度法测定水样中金属离子下限可达ppb级。

The effect of previous powder - particle boundaries ( PPB ) on the quench crack has been studied .

本文研究了FGH95合金原颗粒边界（PPB）对淬火裂纹的影响。

Determination of zinc at ppb levels in high-purity gallium with flameless atomic absorption spectrometry

非火焰原子吸收光谱法测定超纯镓中ppb级锌

A new method of ion chromatography to determine polyphosphates simultaneously in ppb (μ g / 1 ) level was established .

建立了同时测定ppb级（μg/1）多聚磷酸盐的离子色谱新方法。

Determination of ppb level anions in sulfolane by ion chromatography with a novel column-switching injection system ;

综述了离子色谱技术在气溶胶可溶性无机离子测定中的应用。

The percentage of polymorphic bands ( PPB ) was 59.12 % .

结果表明，供试的42个样本多态性条带百分率（PPB）为59.12%；

The presence of inclusions and developed prior particle boundaries ( PPB ) damage mechanical properties and service life of HIP disk .

PPB（原始粉末颗粒边界）和夹杂物等缺陷对盘件的性能和使用寿命不利，必须予以消除。

The sensitivity of Pb , Cu and Co was found to be 0.8 , 0.5 and 0.4 ppb respectively .

铅铜钴的灵敏度分别为0.8、0.5、0.4ppb。

Add 25 ppb Bentonite and allow to hydrate for a minimum of 6 hrs .

按每桶钻井液加25磅的膨润土，允许水化至少6个小时。

Carbides transformation and ppb problems in PM IN-100 Superalloy

IN-100粉末高温合金中碳化物转变和原始颗粒边界问题

The content of aflatoxin Bl in the contaminated fodder was rather high with an amount of 475 ppb .

饲料中黄曲霉素素B1含量相当高，达475ppb。

The Illinois Department of agriculture already had 56 corn samples this season test for aflatoxin over the 20 ppb threshold .

伊利诺斯州农业部今年夏天已经有56个玉米标本在黄曲霉毒素检测中发现超过千分之二十的临界值。

The mean U content in mineral water is 9.20 ± 0.16 ppb , which is 10 times higher than that in other beverages .

矿泉水中铀含量平均值为9.20±0.16ppb，为饮料中平均铀含量的10倍。