电子邮箱

密码

安全问题

注册 忘记密码?

无锡微色谱生物科技有限公司

见微知著,样品分析,如虎添翼

JA0032 QuEChERS and soil analysis. An Overview.
来源:Sample preparation | 作者:Jose Vera | 发布时间: 2136天前 | 2247 次浏览 | 分享到:
This paper reviews the Quick Easy Cheap Effective Rugged Safe (QuEChERS) methods used for the analysis of several pollutants in soil. The recent advances made with this method are discussed.The analysis of pesticide residues and other analytes in soil requires the extraction of analytes from this matrix. Following extraction, a clean-up procedure may be performed, if necessary, prior to instrumental analysis. This review considers all aspects of sample preparation, including extraction and cleanup. Several parameters are discussed in extraction optimization namely: soil type and sample amount, hydration, solvent of extraction QuEChERS content, extraction time and agglomeration prevention. In addition, method performance characteristics in soil studies are critically discussed.
1 Introduction

Soil is a complex and heterogeneous matrix, containing both inorganic and organic components [1], and is often subject to intense chemical pollution. When chemical compounds reach the soil, either via direct intentional application or as a result of accidental spillage [2], many types of physicochemical interactions occur [2,3]. These include adsorption, leaching, and degradation [3]. Adsorption and leaching processes are both influenced by physicochemical properties of the soil and chemicals under consideration [3,4]. Generally, the water-soluble pesticides are more prone to leaching. This leaching process is also affected by the nature of soil. In well-drained or sandy soil, where the rate of water percolation is high, the leaching of these pesticides is also quite significant. Degradation of pesticides is also a complex phenomenon. The fate of pesticides prone to microbial degradation will be dependent upon the microbial flora present and chemical properties of soil, both of which will facilitate such degradation. Similarly, soil pH and other chemical properties beyond those previously mentioned also affect the end result of pesticide presence in the soil. Beyond the confines of the contaminated area, compounds can be transported from soils to other environmental systems, polluting natural resources and affecting ecosystems [5]. In summary, soil contamination by naturally occurring and anthropogenic organic and inorganic chemicals is a serious human health and environmental problem [3,6,7]. Due to the low concentration levels of soil pollutants, sample preparation step is needed to determine the type and quantity of .....



阅读全文
  • 三种 Protein A树脂纯化效率比较及流程优化

    2021-09-20

    简要介绍 dSPE 在全自动移液工作站上应用实现全自动抗体纯化的原理。
    比较了三种 Protein A 纯化 HIgG 的效率及纯化流程优化方法。

  • 使用 IMCSTips 实验全自动纯化(一步)方法及数据分析

    2021-09-20

    1. IMCStips 应用原理展示
    2. His-tagged 蛋白纯化流程优化及数据分析

  • 全自动抗体、蛋白纯化演示

    2021-09-20

    IMCStips 亲和层析柱
    ● 一次层析即可快速产生高纯重组蛋白
    ● 一致性好、回收率高,个样品的差异不到 10%
    ● 可结合各种复杂方法的模板化工作流
    ● 与 Hamilton 移液工作站结合,可在 30 分钟内处理 96 个样品
    ● 可定制的工作流程

  • 振荡器-BenchWaver

    2020-02-08

    BenchWaver™ 把传统的平台摇摆运动与轨道振动器的圆周运动结合起来,这种最优组合能够产生最适合分子生物学应用的三维运动。

  • 均质机-D1030 演示

    2020-02-08

    强力混匀,适于细胞裂解、研磨或均质
    与通用的组织研磨机更快速、更高效
    采用密封2.0mL管,消除交叉感染
    中通量,可同时处理3~6个样品