How to acid digest waste-water sample before heavy metal analysis by ICP?

The procedures for digestion of a river water sample for chemical analysis

Trace Metal analysis by Atomic Absorption Spectrophotometer.

I have digested 0.5 g of sample in HNO³ and diluted upto 100 ml. After analysis on AAS the answer is 0.192 ppm. Now How to calculate the actual conc. of Cu in the actual sample?

I performed a phosphorus analysis from a phosphate rock sample. For this, I took 0.50 g of a sample which I boiled for 1 hour in a mixture of 15 ml HNO3 and 10 ml HClO4. After an hour, I added 50 ml of water to this mixture. I obtained After boiling this mixture, I added 5 ml of water to finally obtain 50 ml of the sample. Then I took 1 ml of the above sample and added 9 ml of water to form a research sample. So how do I calculate the results of the analysis? (ICP-OES)

cheap, best and convinient method for plant and soil sampled digestion for heavy metals determination other than ashing and HCLO4+HNO3 (di-acid)

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i want to estimate the metal present in our plant sample, for this initial step is sample digestion. many reference paper use nitric acid, is there any other method which can follow. need protocol with reference

How to calculate concentration of sample in AAS.  I have prepared 5 gr of sample in 50 ml and then dilution 5 ml in 50 ml. Sample results in AAS 1.0859 concentration. What formula is used to calculate?

Few drops of HNO3 are added in waste water sample before heavy metal determination by AAS. Why it should be added? If not, what problem might be arised?

Hello, i am going to analyse the amount of Lead (pb) present in water by atomic absorption spectrometry in the protocol it says that i have to use 120 ml of nitric acid (1+5) , i'm not exactly sure what this ratio means ! do i have to dilute the nitric acid first and than use it for analysis ? please help