Arsenic

Analytical Periodic Table
 Arsenic Expanded View

Arsenic Print | Periodic Table ]

Location:  Group 15, Period 4
Atomic Weight:  74.9216
Coordination Number:  6
Chemical Form in Solution:  H3AsO4 and HAsO2

Storage & Handling:  Keep tightly sealed when not in use. Store and use at 20 ± 4°C. Do not pipet from container. Do not return portions removed for pipetting to container.

Chemical Compatibility:  Arsenic has no cationic chemistry. It is soluble in HCl, HNO3,H3PO4, H2SO4 and HF aqueous matrices water and NH4OH. It is stable with most inorganic anions (forms arsenate when boiled with chromate) but many cationic metals form the insoluble arsenates under pH neutral conditions. When fluorinated and/or under acidic conditions arsenate formation is typically not a problem at moderate to low concentrations.

Stability:  2-100 ppb levels - stable for months alone or mixed with other elements at equivalent levels - in 1% HNO3 / LDPE container. 1-10,000 ppm solutions chemically stable for years in 1-5% HNO3 / LDPE container.

As Containing Samples (Preparation & Solution):  Metal (soluble in 1:1 H2O / HNO3); Oxides (the oxide exists in crystalline and amorphous forms where the amorphoric form is more water soluble. The oxides typically dissolve in dilute acidic solutions when boiled); Minerals (one gram of powered sample is fused in a Ni0 crucible with 10 grams of a 1:1 mix of K2CO3 and KNO3 and the melt extracted with hot water); Organic Matrices (0.2 to 0.5 grams of the sample are fused with 15 grams of a 1:1 Na2CO3 / Na2O2 mix in a Ni0 crucible. The fuseate is extracted with water and acidified with HNO3).

Atomic Spectroscopic Information:  (red text indicates severe at ~ concs.)
Technique / LineEstimated D.L.*OrderTypeInterferences
ICP-OES 189.042 nm0.05/.005 µg/mL1atomCr
ICP-OES 193.696 nm0.1/.01 µg/mL1atomV, Ge
ICP-OES 228.812 nm0.1/.01 µg/mL1atomCd, Pt, Ir, Co
ICP-MS 75 amu30 pptn/aM+40Ar35Cl, 59Co16O, 36Ar38Ar1H, 38Ar37Cl, 36Ar39K, 150Nd2+, 150Sm2+
*ICP-OES D.L.'s are given as radial / axial view

Arsenic (As) Single-Element Standard
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