Determination of fluorine in Perfluoroalkyl and Polyfluoroalkyl Substances(PFAS)_Hunan Sundy Science and Technology Co., Ltd-Sundy,Calorimeter,Proximate Analyzer,Elemental Analyzer

1.Test procedures

Weigh a certain amount of perfluorohexyl sulfonic acid (reference materials), dissolve it in methanol, dilute it to an appropriate concentration, transfer a suitable volume of the solution onto the ignited quartz wool, perform the test according to the set procedure, and calculate the recovery rate.

2.Combustion conditions

Temperature: 1100℃ Oxygen: 0.4L/min

Argon(carrier): 0.2L/min Argon flow for humidification: 0.1L/min

Water vapor: 0.1mL/min Absorption solution: pure water

Instrument:SDXNS200H

Combustion process

Step	Sample Introduction Time (s)	Distance (mm)	Retention Time (s)
Step 1	17	170	100
Step 1	100	20	100
Step 3	100	15	100
Step 4	150	105	100

3.IC conditions

Analytical Column: IonPac AS19 2*250mm Guard Column: IonPac AG19 2*50mm

Eluent: EGC Ш KOH, 20mM, 0.25mL/min Column temp.: 30℃

Quantitative loop: 400ul Linear range:0.1-1mg/L

Detector: Dionex-ADRS 600

4.Test results

S/N.	CRM	Brand	Type	Theoretical Conc. (ug)	Measured Conc. (ug)	Recovery (%)
1	perfluorohexyl sulfonic acid	TM standard	Low conc.	0.3	0.2938	97.93
2					0.2927	97.57
3					0.2968	98.93
4					0.2899	96.63
5					0.2916	97.20
6					0.2987	99.57
Aver.					0.2939	97.97
RSD(%)					1.12	1.12
1	perfluorohexyl sulfonic acid	TM standard	High conc.	2	1.9278	96.39
2					1.9871	99.36
3					1.9381	96.91
4					1.9787	98.94
5					1.9191	95.96
6					1.9856	99.28
Aver.					1.9561	97.80
RSD(%)					1.59	1.59