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用原子吸收光谱法测定土壤、沉积物中的重金属铅、镉、铜、锌,避免二次污染,消除基体干扰和测定中带来的化学干扰等干扰因素,可取得真实可信的结果. 相似文献
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对《水质65种元素的测定电感耦合等离子体质谱法》(HJ 700-2014)中铜、镉、铅进行了实验室方法验证。结果表明:各元素在浓度范围0~500μg/L内线性关系良好,相关系数均大于0.999。实验室测定水质铜、镉、铅检出限分别为0.08μg/L、0.03μg/L、0.03μg/L,满足该方法要求(铜检出限0.08μg/L、镉检出限0.05μg/L,铅检出限0.09μg/L);相对偏差为1.97%~7.16%,均小于标准要求的20%;加标回收率在91.6%~106%之间,满足标准要求的80%~120%。结果确认实验室具备开展此方法检测水质镉、铜、铅的能力。 相似文献
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《绿色科技》2016,(4)
采用微波消解法消解11种市售安徽产中药饮片,并用原子吸收光谱法测定了各中药饮片中的铜、镉、汞、铅、砷、锌的含量。按照《中国药典》2010版(一部)附录重金属检查法铅、砷、汞、铜、镉、锌的含量测定法进行了测定,参照《药用植物及制剂进出口绿色行业标准》进行评价。结果表明:所测定全部11种安徽产中药饮片重金属铜、镉、铅、汞、砷含量均符合2010版《中国药典》和《药用植物及制剂进出口绿色行业标准》项下规定的限量标准。2010版《中国药典》和《药用植物及制剂进出口绿色行业标准》并没有关于重金属元素锌的限量标准。微波消解—原子吸收光谱法可快速测定中药中重金属的含量,可为临床科学用药安全提供一定的依据。 相似文献
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土壤真菌研究方法及人为干扰对森林土壤真菌群落影响研究进展 总被引:2,自引:0,他引:2
土壤真菌是森林生态循环的重要调解者之一, 与植物和细菌维持着重要的共生关系, 人为干扰会对森林土壤真菌产生影响。土壤真菌调查困难, 对调查方法依赖很大。文中从传统方法、分子方法及二者结合的方法对土壤真菌调查方法进行归纳, 并从传统和分子方法2个层面, 对人为干扰下森林土壤真菌变化的研究进行了综述。目前, 国外已开始利用分子方法对人为干扰影响土壤真菌进行研究, 多从林型转换、火烧方面入手, 对其他人为干扰措施下森林土壤真菌的研究几乎没有。从微生物学角度看, 森林受人为干扰而变化的内在机制尚不清楚。 相似文献
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对杨树肿茎溃疡病的发病情况,发生量测报技术,防治方法进行了调查研究,结果表明,杨树生长的立地条件,林分类型,林龄的大小民受害程度有直接关系,发生量测报技术,研究出各类型拟合方程和拟合理论值;根据试验和方差分析,最好的防治方法是应用“三威洗衣粉液”和“辣椒制剂”进行涂抹。 相似文献
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This study aims to investigate and quantify the porosity in the cross section of Phyllostachys edulis (Moso bamboo) culm wall. The porosity results are expected to be utilised in numerical study of heat and moisture transfer. Computed tomography (CT) and backscattered electron (BSE) imaging methods are utilised in this study because these two methods allow measurements of the anisotropic features of bamboo specimens. The results of these two methods can be represented as the function of the real dimension rather than the pore size distribution of the specimen. The specimens are obtained from eight different locations along the Moso bamboo culms. Both internodes and nodes specimens are measured in this study. The average porosity, standard deviation (SD) and coefficient of variation (COV) are calculated for BSE and CT results. Pearson product-moment correlation coefficient (PPMCC) is also calculated in this study to analyse the correlation between the BSE results and CT results. Typical porosity results from 400 sampling points and 10 portions average porosity are analysed in this study. The CT scanning results show similar trend with BSE results. The correlation relationship between BSE and CT results approaches moderate correlation level to strong correlation level. The average porosity of internode specimens is from 43.9 to 58.8 % by BSE measurement and from 44.9 to 63.4 % by CT measurement. The average porosity of node specimens is from 37.4 to 56.6 % by BSE measurement and from 32.1 to 62.2 % by CT measurement. 相似文献
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Many thrips are pests of commercial crops due to the damage they cause by feeding on developing flowers or vegetables. Thrips
may also serve as vectors for plant diseases, such as tospoviruses. Their small size and predisposition towards enclosed places
makes them difficult to detect by phytosanitary inspection. In this review, several methods available for identifying thrips,
including their advantages and disadvantages, are discussed. A combination of different methods gives the most reliable identification.
Relatively new morphometric, molecular and biochemical methods for identifying thrips species represent valuable alternatives
for situations in which correct identification with classical morphological methods is very difficult, time consuming or virtually
impossible. However, traditional morphological methods should not be neglected, especially because adequate identification
using morphological keys is usually an indispensable first step in the development and validation of these new modern methods.
In addition, modern systems may still require specimen identification to the genus level via morphological keys, or such keys
may be recommended to confirm the results of modern identification methods. 相似文献
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测定二灰级配集料中石灰剂量的方法(试验规程上的方法和改进方法)对测定结果有显著影响。采用改进方法进行检测时,测定结果的波动幅度明显减小。 相似文献
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The resin content in larch wood is usually determined by the traditionalBenzene-Alcohol Extract Method(BAEM).In order to meet the requirement of production prac-tice,the authors present two simple quick determination methods,IR lamp method and hydrogenperoxide solution method.Compared with the results of traditional method,the results of newmethods are nearly the same as former,therefore,both two methods can reflect the change condi-tion of resin content in wood. 相似文献
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中德造林项目林分调查方法相比国内森林经营的调查方法大有不同,通过实践与调查分析,中德造林项目的林分调查方法更先进、易掌握、易操作,能真实反映森林资源状况,更适宜作为国内森林经营的首选方法. 相似文献
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从体积置换法测量木材气体渗透系数的基本原理出发,针对水柱上升和水柱下降两种体积置换法的测量装置,分析了体积置换法测量过程中气体渗透压强的变化,以及非稳态条件对体积置换法测量结果的影响.并详细推导了测量中的有关计算式和对非稳态测量补偿的修正因子.此外,运用动力学分析方法,论证了气体渗透压强在测量中的线性变化.其中关于测量的计算及其修正的关键设定的合理性,进一步从理论上阐明了体积置换法测量木材气体渗透系数的精确性. 相似文献