Cobalt release from inexpensive jewellery: has the use of cobalt replaced nickel following regulatory intervention?

TY - JOUR

T1 - Cobalt release from inexpensive jewellery: has the use of cobalt replaced nickel following regulatory intervention?

AU - Thyssen, Jacob Pontoppidan

AU - Jellesen, Morten S

AU - Menné, Torkil

AU - Lidén, Carola

AU - Julander, Anneli

AU - Møller, Per

AU - Johansen, Jeanne Duus

AU - Møller, Per

PY - 2010/8/1

Y1 - 2010/8/1

N2 - Background: Before the introduction of the EU Nickel Directive, concern was raised that manufacturers of jewellery might turn from the use of nickel to cobalt following the regulatory intervention on nickel exposure. Objectives: The aim was to study 354 consumer items using the cobalt spot test. Cobalt release was assessed to obtain a risk estimate of cobalt allergy and dermatitis in consumers who would wear the jewellery. Methods: The cobalt spot test was used to assess cobalt release from all items. Microstructural characterization was made using scanning electron microscope (SEM) and energy-dispersive spectroscopy (EDS). Results: Cobalt release was found in 4 (1.1%) of 354 items. All these had a dark appearance. SEM/EDS was performed on the four dark appearing items which showed tin-cobalt plating on these. Conclusions: This study showed that only a minority of inexpensive jewellery purchased in Denmark released cobalt when analysed with the cobalt spot test. As fashion trends fluctuate and we found cobalt release from dark appearing jewellery, cobalt release from consumer items should be monitored in the future. Industries may not be fully aware of the potential cobalt allergy problem.

AB - Background: Before the introduction of the EU Nickel Directive, concern was raised that manufacturers of jewellery might turn from the use of nickel to cobalt following the regulatory intervention on nickel exposure. Objectives: The aim was to study 354 consumer items using the cobalt spot test. Cobalt release was assessed to obtain a risk estimate of cobalt allergy and dermatitis in consumers who would wear the jewellery. Methods: The cobalt spot test was used to assess cobalt release from all items. Microstructural characterization was made using scanning electron microscope (SEM) and energy-dispersive spectroscopy (EDS). Results: Cobalt release was found in 4 (1.1%) of 354 items. All these had a dark appearance. SEM/EDS was performed on the four dark appearing items which showed tin-cobalt plating on these. Conclusions: This study showed that only a minority of inexpensive jewellery purchased in Denmark released cobalt when analysed with the cobalt spot test. As fashion trends fluctuate and we found cobalt release from dark appearing jewellery, cobalt release from consumer items should be monitored in the future. Industries may not be fully aware of the potential cobalt allergy problem.

U2 - 10.1111/j.1600-0536.2010.01752.x

DO - 10.1111/j.1600-0536.2010.01752.x

M3 - Journal article

SN - 0105-1873

VL - 63

SP - 70

EP - 76

JO - Contact Dermatitis

JF - Contact Dermatitis

IS - 2

ER -