analisis kandungan logam kadmium pada daging dengan metode AAS

Summary

This presentation discusses the analysis of cadmium content in beef using Atomic Absorption Spectroscopy (AAS). It highlights the importance of beef as a nutritious food source and the potential health risks associated with contamination from heavy metals, particularly cadmium. The speaker explains the process of preparing beef samples for analysis, using AAS to detect cadmium levels, and outlines common challenges like chemical interference and ionization disruptions. The findings suggest that beef sourced from controlled environments has lower cadmium levels than those from areas where animals are exposed to waste. High cadmium content in the body can lead to severe health issues like kidney damage, digestive problems, and even infertility.

Takeaways

• 😀 The presentation discusses the analysis of cadmium (Cd) content in beef using Atomic Absorption Spectroscopy (AAS).
• 😀 Beef is a widely consumed food, rich in protein, energy, fats, phosphorus, iron, and vitamins B12 and C.
• 😀 The safety concern regarding beef is the potential contamination with heavy metals, such as cadmium, due to the feed given to livestock.
• 😀 Livestock in areas like landfills are particularly at risk of cadmium contamination because of the trash in their feed.
• 😀 Cadmium contamination in beef can cause serious health issues such as anemia, organ damage, and impaired brain function.
• 😀 AAS works by exciting atoms with light from a hollow cathode lamp (HCL) and measuring the intensity of emitted light to determine the cadmium concentration.
• 😀 Before analysis, beef samples must be processed into a liquid form through a series of steps including drying, ashing, and dissolving.
• 😀 The sample preparation involves burning the beef at specific temperatures and adding nitric acid (HNO3) to prepare it for AAS analysis.
• 😀 Standard solutions with known concentrations of cadmium are prepared for comparison during the analysis to quantify the cadmium in the sample.
• 😀 Common issues in AAS include chemical interference, matrix effects (such as the presence of salts or acids), and ionization interference, which can affect the accuracy of the results.
• 😀 The cadmium content in the beef tested was found to be 0.4 to 0.44 ppm, which is higher than the allowable limit of 0.3 ppm according to SNI standards.
• 😀 The higher cadmium levels in beef from animals grazing in landfills are linked to the uncontrolled nature of their feed compared to farmed animals fed regulated feed.
• 😀 Cadmium poisoning can lead to kidney damage, digestive issues, reproductive failure, infertility, and nervous system damage, among other health complications.

Q & A

What is the purpose of the study in the script?

The study aims to analyze the cadmium (Cd) content in beef using Atomic Absorption Spectroscopy (AAS) to determine the safety and quality of the meat consumed by the public.

Why is beef an important focus for this analysis?

Beef is widely consumed around the world, including in Indonesia, and is rich in nutrients like protein, energy, fat, phosphorus, iron, and vitamins. However, contamination with heavy metals such as cadmium can pose health risks, making it crucial to analyze its safety.

What are the health risks associated with cadmium contamination in beef?

Cadmium contamination can cause anemia, organ damage, decreased intelligence, gastrointestinal problems, reproductive failure, infertility, immune system damage, and other psychological disorders.

How does the presence of cadmium in beef typically occur?

Cadmium contamination typically arises from livestock being grazed in areas where they can ingest contaminated feed, such as waste from landfills (TPA), which may contain toxic substances like heavy metals.

What is the role of HCL in Atomic Absorption Spectroscopy (AAS)?

In AAS, HCL (Hollow Cathode Lamp) serves to emit light that excites the electrons in the atoms of the sample. The emitted photons help in the analysis by absorbing specific wavelengths of light related to the element being studied, such as cadmium in this case.

What are the steps involved in preparing the beef sample for analysis?

The beef sample is first washed, cut, and weighed. Then, it undergoes a drying process, followed by a controlled incineration in a furnace to remove moisture and organic matter, after which the sample is dissolved and prepared for analysis.

What is the purpose of the monokromator in the AAS process?

The monokromator is used to filter the emitted light and select the specific wavelength corresponding to the element being analyzed (cadmium), ensuring that only the relevant emissions are measured by the detector.

What causes chemical interference in the AAS method?

Chemical interference occurs when the sample contains high levels of salts or acids, which can affect the accuracy of the analysis by interacting with the elements being measured and altering their absorption characteristics.

What is the significance of using standard solutions in the experiment?

Standard solutions with known concentrations are used to calibrate the AAS instrument, ensuring accurate measurement of cadmium levels in the sample by comparing its absorbance to the known standards.

What is the maximum permissible level of cadmium in beef according to the SNI standard?

According to the SNI standard, the maximum permissible level of cadmium in beef for safe consumption is 0.3 ppm (parts per million). Any levels above this threshold are considered unsafe for human consumption.