Lead found in 11 ceramic tableware models, within safety limits

The levels are below the upper limits stipulated by international and mainland standards.

Hong Kong's Consumer Council found traces of lead and cadmium in 40% of 30 models of ceramic tableware it tested, although they are below the upper limits stipulated by international and mainland standards.

Of the sample size-- comprising of 15 cups and 15 bowls-- 11 models released varying concentrations of lead when tested under room temperature and microwave heating.

Meanwhile, about 10% of the samples or 4 models released cadmium from internal surfaces.

However, the council clarified that the levels of lead and cadmium released were below the upper limits stipulated by relevant international and mainland standards. 

No detectable lead and cadmium were found in all 13 models tested that were labeled as microwavable.

Whilst below the upper limits, the council urged manufacturers to review manufacturing processes, to further minimise the possibility of the release of heavy metals.

The International Agency for Research on Cancer (IARC) classifies inorganic lead compounds as Group 2A substances (probably carcinogenic to humans).

Excessive intake over prolonged periods could impair the development of the brain and central nervous system in fetuses, infants and children, resulting in reduced intelligence quotient, stunted growth, and hyperactivity, the council said.

As for cadmium, IARC classified it as Group 1 substances (carcinogenic to humans). Prolonged intake may impair kidney function. Some studies also found that cadmium may impede calcium absorption thereby softening the bones.