The evaluation of copper contamination of food cooked in copper pans using a piezoelectric quartz crystal resonator

Trace elements in tea leaves, made tea and tea infusion: A review

“…The probable reasons of high concentration of Cu in black tea was the use of Cu-bearing Bordeaux mixture used to deal with disease problems and partly due to the copper boards used at the twisting stage (Jin, Du, Zhang, & Lin, 2008). Although Cu is an essential trace element for humans and is an indispensable component for many enzyme systems, it can also act as a toxic metal to which a number of pathogenic characteristics have been attributed, such as non-Indian childhood cirrhosis (Zietz et al, 2003) and Wilson's disease (Verissimo, Oliveira, & Gomes, 2005).…”

Determining the arsenic, cadmium, lead, copper and chromium contents by atomic absorption spectrometry inPangasiusfillets from Vietnam

“…Copper is an essential element for humans, but becomes toxic at high levels and can cause nausea, vomiting and diarrhoea. Furthermore, patients suffering from Wilson's disease must carefully control copper intake through water and food . In order to protect public health, maximum levels of 1.0 mg kg −1 arsenic, 0.05 mg kg −1 cadmium, 0.30 mg kg −1 lead, 30 mg kg −1 copper and 0.10 mg kg −1 chromium are recommended internationally…”

Heavy Metal Concentration in Black Tea in Iran

“…This element can accumulate in living systems and can cause renal distraction, lung inadequacy, bone injury, cancer and high blood pressure in humans (23). Cu as an essential component for human health is a completely necessary element for some enzyme structures, despite these; it is a toxic metal and causes some pathogenic traits, such as non-Indian childhood cirrhosis (24) and Wilson's disease (25). Mn is an essential element for some enzymes such as pyruvate carboxylase of liver, Mndependent or superoxide dismutase of mitochondry and also arginase (26).…”