What are polyatomic interferences?

What are polyatomic interferences?

Polyatomic interferences result from the combination of two or more isotopes from different elements, which usually occur in the plasma. The elements that form the polyatomic interferences usually result from the sample matrix, sample diluent, and argon itself.

How many elements can ICP-MS detect?

ICP-MS can detect many elements at levels below 0.1 part per trillion (ppt) – equivalent to one drop of water (50 uL) in 200 Olympic-sized swimming pools (500 million liters). But ICP-MS can also measure elements at concentrations up to 100s or even 1000s of parts per million (ppm).

How do you choose an internal standard for ICP-MS?

To obtain optimal precision and accuracy, the internal standard should be selected as close in mass number as possible to that of the analyte element(s). When a number of elements over a considerable mass range are to be determined, several internal standards have to be used.

How do you calculate concentration from ICP MS?

Dilution factor D would be volume/mass = 25 ml/200 mg = 0.125 ml/mg = 0.125 l/g. Now, the sample result C is 99 ppm for Mg. Here, 1000 ppm = 1 g/kg, to get the concentration you get the formula: C of Mg = D x C x ((1g/kg)/1000ppm) = (0.125 l/g) x (99 ppm)/((1 g/kg) /1000 ppm)) = 0.012375 g/kg.

What elements can be Analysed with ICP-OES?

The main steps in an ICP-OES analysis are: The elements in the sample to be measured are selected. For example, sulfur (s), lead (Pb) and phosphorus (P). Solutions of the samples are prepared, using the conventional techniques of quantitative chemical analysis.

What is internal standard in ICP-MS?

Internal standards commonly used in ICP-MS include lithium (6Li), scandium (45Sc), germanium (72Ge), yttrium (89Y), rhodium (103Rh), indium (115In), tellurium (125Te), terbium (159Tb), rhenium (185Re) and iridium (191Ir).

What is internal standard in ICP?

Internal standards are used to correct for physical differences in samples and standards by referencing all samples to the same element. A correction is then applied to the sample in accordance with the suppression or enhancement of signal experienced by the internal standard element.

How do you calculate the dilution factor for ICP-OES?

Measurement by ICP-OES 2 Add 3 mL of sample solution and 3 mL of 2% nitric acid to the 8-mL autosampler tube. Mix. After this 2nd dilution (for ICP-OES), nominal dilution factor = (6 mL/3 mL) × (50 mL/0.5 gram) = 200. Y = 4 ppm.