Disodium naphthalene-1,5-disulphonate

Hydrolysis

Administrative data

Endpoint:

hydrolysis

Type of information:

experimental study

Adequacy of study:

other information

Reliability:

4 (not assignable)

Rationale for reliability incl. deficiencies:

other: Secondary literature. Original reference not yet available.

Data source

Reference

Reference 1

Reference Type:

review article or handbook

Title:

Reaxys ID 3642373

Author:

Reaxys

Year:

2011

Bibliographic source:

https://www.reaxys.com/reaxys/secured/start.do

Report date:

2011

Reference 2

Reference Type:

publication

Title:

Electroassisted methods for waste destruction: Silver(II) and peroxydisulfate reagents in the electrochemically mediated oxidation of polyaromatic sulfonates

Author:

Ravera M et al.

Year:

2004

Bibliographic source:

Chemosphere Volume 57, Issue 7, November 2004, Pages 587–594

Materials and methods

GLP compliance:

not specified

Test material

Test material information

Constituent 1

Reference substance name:

Disodium naphthalene-1,5-disulphonate

EC Number:

216-732-0

EC Name:

Disodium naphthalene-1,5-disulphonate

Cas Number:

1655-29-4

Molecular formula:

C10H8O6S2.2Na

IUPAC Name:

disodium naphthalene-1,5-disulphonate

Test material form:

solid: particulate/powder

Remarks:

migrated information: powder

Details on test material:

Purity not reported
Empirical formula: C10H8O6S2*2Na
Molecular mass: 332.263 g/mole

Study design

Analytical monitoring:

not specified

Results and discussion

Any other information on results incl. tables

Results

Method 1:

batch electrolysis at +3.0 V vs SCE; Pt anode; title comp. aq. solution; with AgNO₃ and HNO₃; Ag(II) cation generated in situ; destruction factor increased with reaction time (diagram); absorbance measurement at 287 nm

Method 2:

batch electrolysis at +3.0 V vs SCE; Pt anode; aq. solution; with Na₂SO₄; S₂O₈^(2-) anion generated in situ; destruction factor vs time; effect of pH, temp. and title comp./S₂O₈^(2-) molar ratio; diagrams; absorbance measurement at 287 nm, HPLC and NMR

	Method 1	Method 2
Type	oxidation	oxidation
Concentration	0.05 mol/L = 16.61 g/L	0.05 mol/L = 16.61 g/L
Degradation rate [%]	approx. 100	approx. 100
Exposure time [h]	approx. 4	approx. 10
Temperature [°C]	60	20 - 80
Rate constant	0.1 - 2.57 per hour
pH value	2 - 10
Half-life time [h]	0.27 - 6.93
Degradation product		7-hydroxy-5,8-dioxo-5,8-dihydro-naphthalene-1-sulfonic acid anion; 5,7,8-trihydroxy-5,8-dihydro- naphthalene-1-sulfonic acid anion; carbon dioxide

Applicant's summary and conclusion

Validity criteria fulfilled:

not specified

Conclusions:

The abiotic degradation of disodium naphthalene-1,5-disulphonate was reported with two methods. Method 1: oxidation with AgNO3 and HNO3 showed a degradation rate of approx. 100 % after an exposure time of approx. 4 hours at 60 °C by a concentration of 0.05 mole/L (16.61 g/L). Method 2: Oxidation with Na2SO4; S2O8(2-)anion showed a degradtion rate of approx. 100 % after an exposure time of approx. 10 h at 20 - 80 °C by a concentartion of 0.05 mole/L (16.61 g/L).

Executive summary:

The abiotic degradation of disodium naphthalene-1,5-disulphonate was reported with two methods.

Method 1: oxidation with AgNO₃ and HNO₃ showed a degradation rate of approx. 100 % after an exposure time of approx. 4 hours at 60 °C by a concentration of 0.05 mole/L (16.61 g/L).

Method 2: Oxidation with Na₂SO₄; S₂O₈^(2-)anion showed a degradtion rate of approx. 100 % after an exposure time of approx. 10 h at 20 - 80 °C by a concentartion of 0.05 mole/L (16.61 g/L).

In the oxidation of disodium naphthalene-1,5-disulphonat with Na₂SO₄; S₂O₈ ^(2-) anion arise following degradation products of 7-hydroxy-5,8-dioxo-5,8-dihydro-naphthalene-1-sulfonic acid anion; 5,7,8-trihydroxy-5,8-dihydro- naphthalene-1-sulfonic acid anion; carbon dioxide.