Page:NIOSH Manual of Analytical Methods - 5035.pdf/1

 SUPER ABSORBENT POLYMERS

MW: Varies

CAS: See Table 1

METHOD: 5035, Issue 1

5035

RTECS: None

EVALUATION: PARTIAL

OSHA : no PEL NIOSH: no REL ACGIH: no TLV

Issue 1: 15 August 1994

PROPERTIES: solids; hygroscopic; form gels with water [1]

SYNONYMS: sodium polyacrylate, Sanwet IM-3500 (sodium polyacrylate grafted with starch), Water Lock A-100 (sodium acrylate-acrylamide copolymer grafted with starch), Water Lock B-204 (potassium acrylate-acrylamide copolymer grafted wi th starch), Water Lock G-400 (sodium acrylate-acrylamide copolymer). SAMPLING

MEASUREMENT

SAMPLER:

MEMBRANE FILTER (PVC, 5-µm, 37-mm)

FLOW RATE:

1 to 3 L/min

VOL-MIN: -MAX:

50 L 1500 L

SHIPMENT:

routine

ASHING REAGENTS:

SAMPLE STABILITY:

>8 months @ 25 °C [2]

WAVELENGTH:

324. 7 nm

BLANKS:

2 to 10 field blanks per set

CALIBRATION:

super absorbent polymer in sucrose

RANGES:

see Table 1

BULK SAMPLES: required (20 g)

ACCURACY 3

RANGE STUDIED:

0.02 to 0.15 mg/m for Sanwet IM-3500

BIAS:

not significant

TECHNIQUE:

ICP-AES OR AAS

ANALYTE:

copper

EXTRACTION:

6 mL of 0.07 M cupric acetate; 14 mL of water; ultrasonic bath, 15 min.

70% HNO 3, 10 mL; 70% HClO 4, 1 mL (optional)

ESTIMATED LODs:

see Table 1

PRECISION (Sr):

0.086 [2]

ˆ rT): not determined OVERALL PRECISION (S ACCURACY:

not determined

APPLICABILITY: This method has been used to measure Sanwet IM-3500 in air at a diaper manufacturing plant [2].

INTERFERENCES: Aerosols of copper compounds would interfere; however, this problem is uncommon.

OTHER METHODS: Super absorbent polymers in air can be determined by collection on PVC filters, treatment with hot HCl and measurement of sodium by flame AAS [2].

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition, 8/15/94