Heavy Metals 测试 in Water and Soil

im体育APP’s environmental laboratories provide analysis of 水, 渗滤液, 浪费, 沉积物, 油漆片, plant and animal tissue and soil to test for heavy metals that are harmful to the environment and human health.

A wide range of metallic elements are considered heavy metals. These elements can be harmful in high enough concentrations and they must be quantified by expert testing. Our laboratory experts test for heavy metals using inductively coupled plasma (ICP), 加上任意一个 optical emission spectroscopy (OES) or 质谱分析.

im体育APP tests for many heavy metals, 包括砷, 引领, 铀, 和汞, in a variety of different environmental matrices. Reporting limits for the target metals are usually measured in ppb (parts per billion) but can be as low as ppt (parts per trillion). Our laboratory can provide sample containers, 过滤器, syringes and preservatives to assist with your testing needs.

土壤重金属测试

Depending on which method is required, soil samples are typically extracted using acids such as HNO3 or Aqua Regia and digested in an enclosed system in a hot block or microwave. Other extractions can be used for available metals such as DTPA or 水. Once the metals are extracted the digested sample is filtered and ready for analysis by ICP.

When testing for heavy metals in soil samples there is no maximum holding time; however, 几乎, the lab typically holds the sample for 30-60 days. 如果遵循最佳实践, samples should be placed in an airtight container, 保持凉爽, 避免阳光直射.

水中重金属测试

When taking 水 samples in the field, they are filtered (for dissolved metals analysis) and preserved with acid. Water should be preserved with nitric acid to bring the pH to below 2. This ensures the metals stay as soluble salts and prevents the conversion to insoluble salts which drop out of solution and can bias results artificially low.

For dissolved metals testing, samples should be filtered in the field through a 0.45µm filter and then preserved with nitric acid which is provided by the lab. 一旦保存, the sample holding time can be extended up to 6 months (although the lab tends to only keep samples in-house for 1-2 months).

For total metals testing in 水, simply add nitric acid directly into the sampled 水. If 沉积物 are present in the sample, metals will leach from the solids resulting in a higher concentration of metals in 水 than when testing for dissolved metals. This is a test typically completed on surface 水 and gives an overall view of the mobility of metals in the environment through the 水.

Heavy metals testing with inductively coupled plasma (ICP)

Inductively coupled plasma testing is a technique that can determine concentrations of trace to major elements and can detect most elements in the periodic table.

A solution containing dissolved metals is aspirated through the nebulizer into the spray chamber of the ICP instrument, where it is mixed with argon 气体 to form a fine aerosol. This aerosol then passes into the plasma.

A series of solutions of known concentration are analyzed to give a calibration curve for each element. The instrument software compares the samples to the calibration curves and calculates the concentrations of each element.

im体育APP优势

im体育APP专家拥有专业知识, facilities and equipment to provide a wide range of testing services for soil, 水, 和其他感兴趣的物质. Our laboratories are accredited to ISO 17025 and we test to ASTM E1613 and MIL规格 for metals testing. We are your single-source provider for accurate and timely environmental testing pertaining to every major industry.

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