Treehugger digs a little deeper into how the arsenic is actually getting into the apple juice. Here is a hint:
...China's air is awash in arsenic and lead from the profligate use of coal. Heavy metals sent up coal stacks fall onto plants and soil as particulate matter or are dissolved in rain before they precipitate on plants and soil. Plus, there is a chance they are using arsenic as a pesticide - a practice common in the West 30 to 40 years ago but no longer allowed...