Dipotassium hexachloropalladate

Toxicity to terrestrial plants

Administrative data

Endpoint:

toxicity to terrestrial plants: long-term

Type of information:

read-across from supporting substance (structural analogue or surrogate)

Adequacy of study:

supporting study

Reliability:

2 (reliable with restrictions)

Rationale for reliability incl. deficiencies:

other: This is a non-guideline study

Data source

Reference

Reference Type:

publication

Title:

Palladium uptake by pisum sativum: partitioning effects on growth and reproduction

Author:

Ronchini M. et al.

Year:

2015

Bibliographic source:

Environmental Science and Pollution Research

Materials and methods

Test material

Test material information

Constituent 1

Reference substance name:

Dipotassium tetrachloropalladate

EC Number:

233-049-3

EC Name:

Dipotassium tetrachloropalladate

Cas Number:

10025-98-6

Molecular formula:

Cl4Pd.2K

IUPAC Name:

dipotassium tetrachloropalladate

Study design

Test type:

seed germination/root elongation toxicity test

Study type:

laboratory study

Substrate type:

artificial soil

Total exposure duration:

10 wk

Test conditions

Test temperature:

day/night temperature of 22/18C

Moisture:

moisture levels were monitored every 2 days, compensating evaporation by addition of deionised water in the flowerpot holder

Details on test conditions:

16 seeds in each plastic pot containing 330 g of vermiculite and 1L of nutrient solution containing varying amounts of Pd. Each Pd concentration
and the control were replicated four times. The pots were maintained in a room with a 12-h photoperiod(400 W Philips HDK/400 lamps, 150 μE/m2/s).

Nominal and measured concentrations:

0.10, 0.25. 1, 10 and 25 mg/L of Pd

Results and discussion

Details on results:

Reproductive processes inhibited at low doses (0.1 - 1 mg Pd/L). At concentrations ≥1 mg/L there was developmental delay, late growth resumption, increased leaf biomass and reduction of root mass (15 – 20%).

Applicant's summary and conclusion

Executive summary:

This study found that a low concentration of Pd (mg/L) entering through the roots of the pea seed plant affected the reproductive ability of the plants. The number of seeds produced was inhibited with many of the pods empty. Whilst no impact on the number of fruit were observed, their size had been reduced. Germinability was found to be independent of Pd concentration and the radicle length was stimulated by Pd at 1mg /L with the reversed at 25 mg/L.

The study has a reliability rating of 2 (reliable with restrictions) as the methodology do not follow any recognised guidelines.