Method of resolving contribution ratio to soil contamination by plurality of polluters through sequential extraction scheme and stable isotope analysis scheme

Patent metadata

Field	Value
Publication number	US-2016187312-A1
Application number	US-201514979978-A
Country	US
Kind code	A1
Filing date	Dec 28, 2015
Priority date	Dec 30, 2014
Publication date	Jun 30, 2016
Grant date	—

Abstract

In a method of resolving a contribution ratio to soil contamination by a plurality of polluters through a sequential extraction scheme and a stable isotope analysis scheme, Pb stable isotopes are eluted at 5 types of “cation exchange fraction”, “carbonate fraction”, “iron-oxide and manganese hydroxide-fraction”, “organic matters and sulfide fraction”, and “residual fraction” existing at other types and separated from each other in each step. The Pb stable isotopes obtained in each step are analyzed.
The contribution ratio to soil contamination by the polluters is resolved through a predetermined resolving equation using the content of a Pb stable isotope in each step based on the content ratio of the Pb stable isotopes. The Pb stable isotopes are 206 Pb and 207 Pb.

First claim

What is claimed is:

1 . A method of resolving a contribution ratio to soil contamination by a plurality of polluters through a sequential extraction scheme and a stable isotope analysis scheme, the method comprising:
performing the sequential extraction scheme (S 100 ); and applying an equation of resolving the contribution ratio to the soil contamination to an analysis value of a stable isotope obtained through the sequential extraction scheme (S 200 ).

2 . The method of claim 1 , wherein the performing of the sequential extraction scheme (S 100 ) comprises:
(A) preparing a first sample containing a Pb stable isotope; (B) preparing a first solution of 1M MgCl 2 (pH=7), introducing the first sample into the first solution, and stirring the first sample at a normal temperature for one hour to obtain a second solution, and recovering a second sample which is the first sample remaining without being dissolved; (C) preparing a third solution of 1M CH 3 COONa, adjusting acidity (pH) of the third solution to 5 using HOAc, introducing the second sample into the third solution, and stirring the second sample at a normal temperature for five hours to obtain a fourth solution, and recovering a third sample which is the second sample remaining without being dissolved; (D) preparing a fifth solution of 0.04M NH 2 OH.HCl and 25% HOAc, adjusting acidity (pH) of the fifth solution to 2, introducing the third sample into the fifth solution, and heating the third sample at a temperature of 96° C. for six hours to obtain a sixth solution, and recovering a fourth sample which is the third sample remaining without being dissolved; (E) preparing a seventh solution of 30% H 2 O 2 and 0.02M HNO 3 , introducing the fourth sample into the seventh solution, cooling the fourth sample at a temperature of 85° C. for five hours, additionally introducing an eighth solution of 3.2M NH 4 OAc and 20% HNO 3 into the seventh solution, and performing stirring at a normal temperature for 30 minutes to obtain a ninth solution, and recovering a fifth sample which is the fourth sample remaining without being dissolved; (F) introducing the fifth sample into a tenth solution of HF and HClO 4 , completely drying the fifth sample through evaporation at a temperature of 110° C., introducing a 12M HCl solution, and performing heating for 30 minutes to completely dissolve the fifth sample and to obtain an eleventh solution; and (G) analyzing contents of Pb stable isotopes contained in Pb stable isotope eluates of the second, fourth, sixth, ninth, and eleventh solutions obtained in steps (B) to (F).

3 . The method of claim 2 , wherein the Pb stable isotopes used in step (G) of analyzing the contents of the Pb stable isotopes are 206 Pb and 207 Pb.

4 . The method of claim 3 , wherein 206 Pb/ 207 Pb values measured from the second, fourth, sixth, and ninth solutions are anthropogenic Pb stable isotope values resulting from a human activity.

5 . The method of claim 3 , wherein a 206 Pb/ 207 Pb value measured from the eleventh solution is a geogenic Pb stable isotope value resulting from a natural activity.

6 . The method of claim 4 , wherein in the applying of the equation of resolving the contribution ratio (S 200 ), the anthropogenic Pb stable isotope values are obtained through following Equation,

(
206



Pb


/

207


Pb

)

anthr
.

=

[

C
meas

×

(
206



Pb


/

207


Pb

)

meas

]

-

[

C
back

×

(
206



Pb


/

207


Pb

)

back

]

C
meas

-

C
back

Equation

in which ( 206 Pb/ 207 Pb) anthr. denotes a Pb stable isotope value by anthropogenic pollution,
( 206 Pb/ 207 Pb) meas denotes a

Assignees

• Korea Inst Geoscience & Minera

Inventors

• Lee Pyeong-Koo

Classifications

• G01N2030/009

  Extraction · CPC title

• G01N33/24 Primary

  Earth materials (G01N33/42 takes precedence) · CPC title

• G01N33/20 Primary

  Metals · CPC title