Container Material Considerations for Collection and Storage of Atomic Absorption Spectroscopy Samples

Analysis byAtomic Absorption Spectroscopy需要收集，存储和有时运输样品。容器可以造成原子吸收光谱样品的污染风险，并且污染程度将在延长的储存期方面具有重要意义。

常用的集装箱材料是由

• 玻璃
• Quartz
• Plastics

在本文中，我们将涵盖这些材料的性质，使其理想地收集和储存AAS样品。

Container pre-treatment

It goes without saying that the container should be inert with least possibilities of leaching or adsorption. New containers require pre-treatment. Glass containers should be soaked overnight in 1:1 concentrated at \(HNO_3\) or HCl prior to use. The pre-treatment minimizes the alkaline character of glassware. Plastics should be soaked in 1:1 nitric acid for a week followed by a week in HCl and finally a week in deionised water.

使用过的容器应用非磷酸盐洗涤剂，去离子水，酸化的二聚角串联洗涤，最后用去离子蒸馏水。

Container materials

玻璃

Some solvents and acids gradually dissolve glass and get contaminated with elements such as Si, K, Na, Ca, Mg and Al.

Borosilicate glass

• Most commonly used
• Resistant to most acids except HF and boiling \(H_3PO_4\)
• Not suitable for heating or storage of hot alkaline solutions
• Should not be heated to temperatures above 500°C

Quartz

Quartz exists in opaque and transparent forms. Opaque form has higher trace element concentration and is not suitable for trace metal analysis. Containers made from transparent parts are used for sampling for trace metals AAS analysis.

• Borosilicate glass parts also attacked by HF and boiling \(H_3PO_4\)
• Suitable for strong alkaline solutions
• Can be heated up to 1100°C

Plastics

Plastic containers have their own advantages and disadvantages. However, availability of different chemically modified plastic materials do limit some of the disadvantages.

好处

• Unbreakable
• Preferred for trace metal analysis due to greater inertness

缺点

• 不可能加热
• Cannot be used with organic solvents

The commonly used plastic container materials are:

• Polypropylene
• 聚四氟乙烯（PTFE或Teflon）
• Fluorinatedethylenepropylene (FEP)
• Perfluoroalkoxy (PFA)
• HDPE (high-density polyethylene)
• LDPE (low-density polyethylene)

PFA有这样一个优秀的可取的属性s acid digestions upto 250°C using acids such as HF, HNO3, HCl, H2SO4 and H3PO4. It is also used for making microwave digestions vessels

LDPE and HDPE bottles are typically used for extended storage of solutions with upto 10% \(HNO_3.\)

容器材料的选择将取决于许多考虑因素，例如：

• Required level of detection
• Inertness of container
• 能够处理热沸腾的酸
• 在分析之前的存储期。

由于良好的练习样本应在准备或收集后最早的机会分析。

Please share your experiences and views on different container materials and your comments.