The application of electrothermal atomization techniques for atomic absorption spectroscopy has increased many fold in recent years. Along with this widespread application, matrix interferences in pulse-type electrothermal atomizers have been observed. Until recently, very few interference studies have involved constant temperature electrothermal atomizers. In this paper a comparison is made of interferences in pulse-type vs constant temperature atmoziers for various metal chlorides on the Mn atomic absorption signal. The results show no interferences in the constant temperature system while significant matrix interferences are observed in the pulse type unit. It is proposed that the observed differences are due mainly to the rate at which volatilized analyte attains atomization temperature and the residence time in the hot environment.

Negative interfering effects on the carbon rod atomizer (CRA) absorbances of Mn, Fe, and Ni were found to occur in the presence of the chlorides of the major cations (Ca, Mg, Na) in the soil solution. These interferences were corrected either by precipitation of the chlorides with silver nitrate or by incorporating a relatively high level of sulfuric or nitric acid into the sample volume. Magnesium ion, irrespective of the associated anion, was found to lower the Cd signal on the CRA. High concentrations of MgSO4 caused lowering of the Mn signal when using air‐acetylene flame. This lowering effect of MgSO4 was avoided upon using N2O‐acetylene flame. No interferences were noticed for Mn and Zn when using the constant temperature furnace developed at Montana State Univ.

Crab is fishery potential fishery product but it is a perishable food. Application and handling of crab can be done by processing it into canned products. Crab are very likely to be polluted by heavy metals in these waters because of heavy metal contamination is already very high in the ocean. The purpose of this activity is to find out directly assay methods of heavy cadmium (Cd) in canned crab product and know the standard limit of heavy metal cadmium (Cd) The analytical method of cadmium heavy metal content (Cd) on several canned crab products using the method analysis of SNI 2354.5: 2011. Based on the results of the crab product analytical (Portunus pelagicus) the results showed  <0.5 mg / kg, so that based on the threshold of cadmium (Cd) on the tin crab pasteuriation product is regulated in SNI 6929: 2016, the product is safe and suitable for consumption.

Anadara granosa are one of the benthic organisms that are frequently reported because contained heavy metals because of water pollution. This is because A. granosa is a feeder filter so that accumulates heavy metals in its body. Reduce the levels of heavy metals with activated charcoal from coconut shells in the absorbance process using the depuration method. It is re-optimized with the use of nano-active charcoal. The goal was to determine the effect of concentrations of nano-active charcoal from coconut shells on the heavy metal content of A. granosa. Stages of this reserch, namely charcoal activation, ultrasonication, SEM testing, blood shell depuration, and heavy metal testing. Based on the results of the Scanning Electron Microscope (SEM) Test it is known that the charcoal particles are sized 10-9 nm. The types of heavy metals found included hydrargyrum (Hg) 0.0009 mg/kg, cadmium (Cd) 0.62 mg/kg, and plumbum (Pb) 1.82 mg/kg. Heavy metals with lowest content is found in P5 (active charcoal concentration of 15% of the sample weight) of mercury (Hg) 0.0002 mg/kg; cadmium (Cd) 0.1 mg/kg; and lead (Pb) 0.373 mg/kg. This shows that the higher concentraion of activated charcoal given, the lower heavy metal content.