MIL --- D TL --- 211F
Pe rce nt Acidity a s Phosphoric Acid = 15.8 x 10 ---3A
W
whe re :
A=
ICP re a ding (m /ml)
g
W=
we ight of spe cime n (g)
4.2.4.3 Red Phosphorus, Copper, Iron.
(a) Sample in solution. We igh 0.2+ .05 g (to ne a re st 0.1 mg) of the R P into a 400 ml fla sk.
Add 50 ml of distille d wa te r, 25 ml of conce ntra te d nitric a cid, a nd 25 ml of conce ntra te d
hydrochloric a cid. H e a t the sa mple slowly until the re is a pproxima te ly 30 ml. Re move the
sa mple from the source of he a t a nd cove r with a wa tch gla ss if the re a ction be come s viole nt. If
pa rticula te s a re still pre se nt, a dd 10 ml of nitric a cid a nd wa sh down the inside of the be a ke r
with distille d wa te r. E va pora te the conte nts to a pproxima te ly 30 ml, cool a nd filte r (with a
Wha tma n 42 or e qua l) into a 100 ml volume tric fla sk. D ilute to volume with wa te r.
(b) Copper. Run pre pa re d solution in ICP
Pe rce nt Cu = .01A
W
whe re :
A=
conce ntra tion of Cu from ICP in m /ml
g
W=
we ight of sa mple in gra ms
(c) Iron. Run pre pa re d solution in ICP
Pe rce nt Fe = .01A
W
whe re :
A=
conce ntra tion of Fe from ICP in m /ml
g
W=
we ight of sa mple in gra ms
(d) Red Phosphorus. Ta ke 5 ml sa mple from 100 ml fla sk a nd dilute to 200 ml with dis-
tille d wa te r. Run solution in ICP. Bla nks a re a lso run to de te rmine if a djustme nts a re ne ce ssa ry.
(.4A) - E - 0.316F
Pe rce nt R P = W
whe re :
A=
conce ntra tion of P from ICP, in m /ml
g
W=
we ight of sa mple , in gra ms
E=
Pe rce nt WP from 4.2.4.1
F=
Pe rce nt H 3PO 4 from 4.2.4.2
* Se e
note 6.10 if instrume nt drift is pre se nt.
4.2.4.4 Dust Suppressant. We igh 5.0 g of spe cime n into a 150 ml be a ke r a nd a dd 50 ml of
me thyle ne chloride a nd a 1 inch stirring ba r. Cove r with a wa tch gla ss a nd stir for 30 minute s.
F ilte r the solution through a Wha tma n No. 42 or e qua l filte r pa pe r into a cle a n, ta re d, gla ss
8
For Parts Inquires submit RFQ to Parts Hangar, Inc.
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business