Tungsten

Tungsten does not react with most acids, under normal conditions.

Tungsten does not react with air under normal conditions. If heated or brought to burn, tungsten will react with oxygen, O₂.

2 W(s) + 3 O₂(g) 2 WO₃(s)

Tungsten does not appear to react wih alkalis, under normal conditions.

Tungsten reacts with halogens, forming the corresponding tungsten halides. Tungsten will react with fluorine at room temperature, whereas the remaining halogens requires heat. For the most part, tungsten(VI) halides are formed, but under controlled conditions, chlorine can also form tungsten(V) chloride

W(s) + 3 F₂(g) WF₆(s) [colourless]
W(s) + 3 Cl₂(g) WCl₆(s) [dark blue]
2 W(s) + 5 Cl₂(g) 2 WCl₅(s) [dark green]
W(s) + 3 Br₂(g) WBr₆(s) [dark blue]
W(s) + 3 I₂(g) WI₆(s)

Tungsten does not react with hydrogen, but hydrogen can be dissolved in tungsten [6].

Tungsten does not reacts with water, under normal conditions.

Method - Inductively Coupled Plasma Method [5]. A portion of the sample is digested in a combination of acids. The digest is aspirated into an 8,000 K argon plasma where resulting light emission is quantified for 30 elements simultaneously.

Method limit of detection in water = 0.03 mg/L
Method limit of detection in soil = 2.00 mg/kg