Water | Acme Labs

By: Acme Labs  09-12-2011
Keywords: Metals, Detection Limits

As water contacts an ore deposit, major changes occur in its chemical composition. This can occur as rain causing weathering on rocks or flowing underground water. These water soluble weathering products and suspended matter can then be compared to background levels of chemical elements in the water to aid in determining the dispersion pattern.

The sensitivity of the ICP-Mass Spectrometers at AcmeLabs provides the ultra low detection limits required to determine background and anomalous levels.

The mobility of water makes it an excellent exploration tool. As water contacts an ore deposit, major changes occur in its chemical composition. This can occur as rain causing weathering on rocks or flowing underground water. These water soluble weathering products and suspended matter can then be compared to background levels of chemical elements in the water to aid in determining the dispersionpattern.The sensitivity of the ICP-Mass Spectrometers at AcmeLabs provides the ultra low detection limits required to determine background and anomalous levels.

Preparation

Samples received by AcmeLabs are run as received. In order to ensure the most accurate readings of samples submitted it is recommended that the following handling procedures be considered when planning your sampling and choosing a method of delivery for samples.

Sampling

In order to ensure a representative sample, samples should be collected in pre-cleaned, HDPE plastic bottles that have been rinsed with sample three times prior to use. Keep in mind that if dissolved metals are required the sample should be filtered through a 0.45 um filter prior to acidification.

Preservation

If anions, pH alkalinity or conductivity are required samples should be kept refrigerated. For metals analysis due to the problems of absorption or precipitation the sample should be acidified to pH <2 as soon as possible after collection with environmental grade (ultra pure) nitric acid. Pre-acidifying sample bottles before a sampling program is not recommended as this can result in leaching of metals from the bottle. Unacidified filtered samples can be acidified at the laboratory but must sit for seven days to dissolve any absorbed or precipitated metals.

Important : Acidified water samples can not be analysed for anions and a second unacidified sample should be sent if required.

The following table summarizes the BC Ministry of Water, Land and Air Protection’s recommendations for sample preservation and holding times which should be considered when planning your sampling and choosing a method of delivery for samples.

Analyte Recommended Preservation Stability
F None 28 days
pH Store cool 4°C 72 hours
Conductivity Store cool 4°C 28 days
Alkalinity Store cool 4°C 72 hours
Anions Store cool 4°C 28 days
Metals Nitric acid to pH<2 Metal dependent

Keywords: Detection Limits, Metals,

Other products and services from Acme Labs

09-12-2011

Rock and Drill Core | Acme Labs

AcmeLabs welcomes and encourages discussion with the geoscientist to determine the most appropriate analytical scheme of preparation, digestion and analysis to match the needs of their program. Rock and core samples are dried then prepared by particle size reduction to produce a homogeneous sub-sample which is representative of the original sample.


09-12-2011

Vegetation | Acme Labs

Factors to be considered include collecting a single species and sampling the same part of this species in order to compare “apples with apples”; also the same age of plant and same time of year. Depending on the size of the plant and particularly the size of its root system, this can provide the geologist with a significant geochemical signature.


09-12-2011

Soil, Till and Sediment | Acme Labs

Analysis consists typically of two stages comprising extraction of the desired elements into a solution and element determination by instrumental analysis of the solution. The potential of these tools have increased many fold in recent years with powerful new ICP-MS packages and desktop software for geochemical interpretation.


09-12-2011

Services | Acme Labs

Sample preparation is a large part of our business because most samples require preparation prior to analysis and because correct preparation is critical to obtaining appropriate and correct results. Acme routinely processes a wide range of sample types including, rocks, drill core, drill cuttings, soils, stream sediments, till, clay and water.